Partial backport without changes to locale files.

Fix #8461 - fix misspelling of {{AppSubUrl}} and other misspelling in template
Fixes /explore and organisation redirection

* Use PathUnescape instead of QueryUnescape when working with branch names

Currently branch names with a '+' fail in certain situations because
QueryUnescape replaces the + character with a blank space.

Using PathUnescape should be better since it is defined as:

// PathUnescape is identical to QueryUnescape except that it does not
// unescape '+' to ' ' (space).

Fixes #6333

* Change error to match new function name

* Add new util function PathEscapeSegments

This function simply runs PathEscape on each segment of a path without
touching the forward slash itself. We want to use this instead of
PathEscape/QueryEscape in most cases because a forward slash is a valid name for a
branch etc... and we don't want that escaped in a URL.

Putting this in new file url.go and also moving a couple similar
functions into that file as well.

* Use EscapePathSegments where appropriate

Replace various uses of EscapePath/EscapeQuery with new
EscapePathSegments. Also remove uncessary uses of various
escape/unescape functions when the text had already been escaped or was
not escaped.

* Reformat comment to make drone build happy

* Remove no longer used url library

* Requested code changes

* fix display dashboard even if require to change password

* fix comments

* fix bug prohibit login not applied on dashboard

* fix tests

* fix bug user status leak

* fix typo

* return after render

* feat(repo): support search repository by topic name

* fix not respecting landing page setting

* fmt

* add landing page test

* Added repository search order by stars or forks.
Added Forks column to admin repository list.

Signed-off-by: Alexey Terentyev <axifnx@gmail.com>

* Renamed search repo template

Signed-off-by: Alexey Terentyev <axifnx@gmail.com>

* add global code search on explore

* fix bug when no anyone public repos

* change the icon

* fix typo and add UnitTypeCode check for login non-admin user

* fix ui description when no match

* Replace all ctx.Handle with ctx.ServerError or ctx.NotFound

* Change Handle(403) to NotFound, avoid using macaron's NotFound

* Add repo type option to /api/repo/search

* Add tests and fix result of collaborative filter in specific condition

* Fix/optimize search & tests

* Improve integration tests

* Fix lint errors

* Fix unit tests

* Change and improve internal implementation of repo search

* Use NonexistentID

* Make search api more general

* Change mirror and fork search behaviour

* Fix tests & typo in comment

* hide unactive on explore users and some refactors

* fix test for removed Organizations

* fix test for removed Organizations

* fix imports

* fix logic bug

* refactor the toConds

* Rename TestOrganizations to TestSearchUsers and add tests for users

* fix other tests

* fix other tests

* fix watchers tests

* fix comments and remove unused code

* Move swagger interface under /api/v1

* Update swagger-ui

* Add /api/swagger and prepare for multiple api version

* Update test links

* Fix footer link

* Fix and remove FIXME

* Respect membership visibility

* Fix/rewrite searchRepositoryByName function

* Add unit tests

* Add integration tests

* Remove Searcher completely

* Remove trailing space

* Remove redudant functions and code

* sort repositories by `updated_unix` in Explore

* Fix UI problem

* Added missing sort order "newest"

* Change default sort order

* fmt

* fix missing collabrative repos

* fix bug of collabrative

* fix SQL quotes

- Generate swagger.json into public/
- Add swagger-ui auto-installation
- Add footer link to local swagger-ui
- Add /swagger url for using app url.
- Fix Swagger-UI version via git tag

* fix #1653 sort on repo size

* fix minor mistake in en-us locale

* fix: Admin can see all private repositories on Explore page.

* refactor: fix session

* refactor: small optimize for sql query

* fix: get owner name if Searcher is not nil or user star page.

* UI config to toggle whether user email shows up in Explore Users

* Recommendation made by @tboerger
66a1c59fe7 (r94122732)

* fixed typo, rename ShowUserEmailInExplore to ShowUserEmail

* Fixed typo merged conflict

* Hide email in the user profile page

if you are active ShowUserEmail
ref https://github.com/go-gitea/gitea/pull/336#issuecomment-269843725

* Please replace MustBool() with MustBool(true)

* resolved #296

* Indentation fixed

* golint fixed for modules/setting

* typo fixed and renamed UNIXSOCKET to UnixSocket

* golint fixed for parts of routers root, dev and org dirs

* add user/auth.go golint fixed

* rename unnecessary exported to unexported and user dir golint fixed

- Update import paths from github.com/go-gitea to code.gitea.io
- Fix import path for travis

See https://docs.travis-ci.com/user/languages/go#Go-Import-Path

* Add ability to explore organizations

* Use right icon for org explore links

- update glide info

Both are possible on explore and admin panel

Conflicts:
	modules/setting/setting.go

Conflicts:
	templates/repo/release/list.tmpl
	templates/user/dashboard/dashboard.tmpl

Conflicts:
	routers/repo/setting.go