Moved vendored js/css into `public/vendor` and documented sources (#1484) (#2241)

* Cleaning up public/ and documenting js/css libs.

This commit mostly addresses #1484 by moving vendor'ed plugins into a
vendor/ directory and documenting their upstream source and license in
vendor/librejs.html.

This also proves gitea is using only open source js/css libraries which
helps toward reaching #1524.

* Removing unused css file.

The version of this file in use is located at:
  vendor/plugins/highlight/github.css

* Cleaned up librejs.html and added javascript header

A SafeJS function was added to templates/helper.go to allow keeping
comments inside of javascript.

A javascript comment was added in the header of templates/base/head.tmpl
to mark all non-inline source as free.

The librejs.html file was updated to meet the current librejs spec. I
have now verified that the librejs plugin detects most of the scripts
included in gitea and suspect the non-free detections are the result of
a bug in the plugin. I believe this commit is enough to meet the C0.0
requirement of #1534.

* Updating SafeJS function per lint suggestion

* Added VERSIONS file, per request

2 files changed, 0 insertions, 297 deletions

diff --git a/public/plugins/codemirror-5.17.0/mode/ebnf/ebnf.js b/public/plugins/codemirror-5.17.0/mode/ebnf/ebnf.js
deleted file mode 100644
index 9618f8e42b..0000000000
--- a/public/plugins/codemirror-5.17.0/mode/ebnf/ebnf.js
+++ /dev/null
@@ -1,195 +0,0 @@
-// CodeMirror, copyright (c) by Marijn Haverbeke and others
-// Distributed under an MIT license: http://codemirror.net/LICENSE
-
-(function(mod) {
-  if (typeof exports == "object" && typeof module == "object") // CommonJS
-    mod(require("../../lib/codemirror"));
-  else if (typeof define == "function" && define.amd) // AMD
-    define(["../../lib/codemirror"], mod);
-  else // Plain browser env
-    mod(CodeMirror);
-})(function(CodeMirror) {
-  "use strict";
-
-  CodeMirror.defineMode("ebnf", function (config) {
-    var commentType = {slash: 0, parenthesis: 1};
-    var stateType = {comment: 0, _string: 1, characterClass: 2};
-    var bracesMode = null;
-
-    if (config.bracesMode)
-      bracesMode = CodeMirror.getMode(config, config.bracesMode);
-
-    return {
-      startState: function () {
-        return {
-          stringType: null,
-          commentType: null,
-          braced: 0,
-          lhs: true,
-          localState: null,
-          stack: [],
-          inDefinition: false
-        };
-      },
-      token: function (stream, state) {
-        if (!stream) return;
-
-        //check for state changes
-        if (state.stack.length === 0) {
-          //strings
-          if ((stream.peek() == '"') || (stream.peek() == "'")) {
-            state.stringType = stream.peek();
-            stream.next(); // Skip quote
-            state.stack.unshift(stateType._string);
-          } else if (stream.match(/^\/\*/)) { //comments starting with /*
-            state.stack.unshift(stateType.comment);
-            state.commentType = commentType.slash;
-          } else if (stream.match(/^\(\*/)) { //comments starting with (*
-            state.stack.unshift(stateType.comment);
-            state.commentType = commentType.parenthesis;
-          }
-        }
-
-        //return state
-        //stack has
-        switch (state.stack[0]) {
-        case stateType._string:
-          while (state.stack[0] === stateType._string && !stream.eol()) {
-            if (stream.peek() === state.stringType) {
-              stream.next(); // Skip quote
-              state.stack.shift(); // Clear flag
-            } else if (stream.peek() === "\\") {
-              stream.next();
-              stream.next();
-            } else {
-              stream.match(/^.[^\\\"\']*/);
-            }
-          }
-          return state.lhs ? "property string" : "string"; // Token style
-
-        case stateType.comment:
-          while (state.stack[0] === stateType.comment && !stream.eol()) {
-            if (state.commentType === commentType.slash && stream.match(/\*\//)) {
-              state.stack.shift(); // Clear flag
-              state.commentType = null;
-            } else if (state.commentType === commentType.parenthesis && stream.match(/\*\)/)) {
-              state.stack.shift(); // Clear flag
-              state.commentType = null;
-            } else {
-              stream.match(/^.[^\*]*/);
-            }
-          }
-          return "comment";
-
-        case stateType.characterClass:
-          while (state.stack[0] === stateType.characterClass && !stream.eol()) {
-            if (!(stream.match(/^[^\]\\]+/) || stream.match(/^\\./))) {
-              state.stack.shift();
-            }
-          }
-          return "operator";
-        }
-
-        var peek = stream.peek();
-
-        if (bracesMode !== null && (state.braced || peek === "{")) {
-          if (state.localState === null)
-            state.localState = CodeMirror.startState(bracesMode);
-
-          var token = bracesMode.token(stream, state.localState),
-          text = stream.current();
-
-          if (!token) {
-            for (var i = 0; i < text.length; i++) {
-              if (text[i] === "{") {
-                if (state.braced === 0) {
-                  token = "matchingbracket";
-                }
-                state.braced++;
-              } else if (text[i] === "}") {
-                state.braced--;
-                if (state.braced === 0) {
-                  token = "matchingbracket";
-                }
-              }
-            }
-          }
-          return token;
-        }
-
-        //no stack
-        switch (peek) {
-        case "[":
-          stream.next();
-          state.stack.unshift(stateType.characterClass);
-          return "bracket";
-        case ":":
-        case "|":
-        case ";":
-          stream.next();
-          return "operator";
-        case "%":
-          if (stream.match("%%")) {
-            return "header";
-          } else if (stream.match(/[%][A-Za-z]+/)) {
-            return "keyword";
-          } else if (stream.match(/[%][}]/)) {
-            return "matchingbracket";
-          }
-          break;
-        case "/":
-          if (stream.match(/[\/][A-Za-z]+/)) {
-          return "keyword";
-        }
-        case "\\":
-          if (stream.match(/[\][a-z]+/)) {
-            return "string-2";
-          }
-        case ".":
-          if (stream.match(".")) {
-            return "atom";
-          }
-        case "*":
-        case "-":
-        case "+":
-        case "^":
-          if (stream.match(peek)) {
-            return "atom";
-          }
-        case "$":
-          if (stream.match("$$")) {
-            return "builtin";
-          } else if (stream.match(/[$][0-9]+/)) {
-            return "variable-3";
-          }
-        case "<":
-          if (stream.match(/<<[a-zA-Z_]+>>/)) {
-            return "builtin";
-          }
-        }
-
-        if (stream.match(/^\/\//)) {
-          stream.skipToEnd();
-          return "comment";
-        } else if (stream.match(/return/)) {
-          return "operator";
-        } else if (stream.match(/^[a-zA-Z_][a-zA-Z0-9_]*/)) {
-          if (stream.match(/(?=[\(.])/)) {
-            return "variable";
-          } else if (stream.match(/(?=[\s\n]*[:=])/)) {
-            return "def";
-          }
-          return "variable-2";
-        } else if (["[", "]", "(", ")"].indexOf(stream.peek()) != -1) {
-          stream.next();
-          return "bracket";
-        } else if (!stream.eatSpace()) {
-          stream.next();
-        }
-        return null;
-      }
-    };
-  });
-
-  CodeMirror.defineMIME("text/x-ebnf", "ebnf");
-});
diff --git a/public/plugins/codemirror-5.17.0/mode/ebnf/index.html b/public/plugins/codemirror-5.17.0/mode/ebnf/index.html
deleted file mode 100644
index 13845629b3..0000000000
--- a/public/plugins/codemirror-5.17.0/mode/ebnf/index.html
+++ /dev/null
@@ -1,102 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <title>CodeMirror: EBNF Mode</title>
-    <meta charset="utf-8"/>
-    <link rel=stylesheet href="../../doc/docs.css">
-
-    <link rel="stylesheet" href="../../lib/codemirror.css">
-    <script src="../../lib/codemirror.js"></script>
-    <script src="../javascript/javascript.js"></script>
-    <script src="ebnf.js"></script>
-    <style type="text/css">.CodeMirror {border-top: 1px solid black; border-bottom: 1px solid black;}</style>
-  </head>
-  <body>
-    <div id=nav>
-      <a href="http://codemirror.net"><h1>CodeMirror</h1><img id=logo src="../../doc/logo.png"></a>
-
-      <ul>
-        <li><a href="../../index.html">Home</a>
-        <li><a href="../../doc/manual.html">Manual</a>
-        <li><a href="https://github.com/codemirror/codemirror">Code</a>
-      </ul>
-      <ul>
-        <li><a href="../index.html">Language modes</a>
-        <li><a class=active href="#">EBNF Mode</a>
-      </ul>
-    </div>
-
-    <article>
-      <h2>EBNF Mode (bracesMode setting = "javascript")</h2>
-      <form><textarea id="code" name="code">
-/* description: Parses end executes mathematical expressions. */
-
-/* lexical grammar */
-%lex
-
-%%
-\s+                   /* skip whitespace */
-[0-9]+("."[0-9]+)?\b  return 'NUMBER';
-"*"                   return '*';
-"/"                   return '/';
-"-"                   return '-';
-"+"                   return '+';
-"^"                   return '^';
-"("                   return '(';
-")"                   return ')';
-"PI"                  return 'PI';
-"E"                   return 'E';
-&lt;&lt;EOF&gt;&gt;               return 'EOF';
-
-/lex
-
-/* operator associations and precedence */
-
-%left '+' '-'
-%left '*' '/'
-%left '^'
-%left UMINUS
-
-%start expressions
-
-%% /* language grammar */
-
-expressions
-: e EOF
-{print($1); return $1;}
-;
-
-e
-: e '+' e
-{$$ = $1+$3;}
-| e '-' e
-{$$ = $1-$3;}
-| e '*' e
-{$$ = $1*$3;}
-| e '/' e
-{$$ = $1/$3;}
-| e '^' e
-{$$ = Math.pow($1, $3);}
-| '-' e %prec UMINUS
-{$$ = -$2;}
-| '(' e ')'
-{$$ = $2;}
-| NUMBER
-{$$ = Number(yytext);}
-| E
-{$$ = Math.E;}
-| PI
-{$$ = Math.PI;}
-;</textarea></form>
-      <script>
-        var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
-          mode: {name: "ebnf"},
-          lineNumbers: true,
-          bracesMode: 'javascript'
-        });
-      </script>
-      <h3>The EBNF Mode</h3>
-      <p> Created by <a href="https://github.com/robertleeplummerjr">Robert Plummer</a></p>
-    </article>
-  </body>
-</html>