Replace SWF clippy with clipboard.js on ticket page

The ticket page also has some copy-to-clipboard buttons, which get
updated to work with JS instead of SWF.

src/main/java/com/gitblit/wicket/pages/TicketPage.html

@@ -586,20 +586,14 @@ pt push</pre>
   		<img wicket:id="copyIcon" wicket:message="title:gb.copyToClipboard"></img>
   	</span>
 </wicket:fragment>
-    
 
-<!-- flash-based button-press copy & paste -->
-<wicket:fragment wicket:id="clippyPanel">
-	<object wicket:message="title:gb.copyToClipboard" style="vertical-align:middle;"
-   			wicket:id="clippy"
-   			width="14" 
-   			height="14"
-   			bgcolor="#ffffff" 
-       		quality="high"
-       		wmode="transparent"
-       		scale="noscale"
-       		allowScriptAccess="sameDomain"></object>
-</wicket:fragment>
+
+	<!-- JavaScript automatic copy to clipboard -->
+	<wicket:fragment wicket:id="clippyPanel">
+		<span class="tooltipped tooltipped-n">
+			<img class="ctcbtn" wicket:id="copyIcon" wicket:message="title:gb.copyToClipboard" />
+		</span>
+	</wicket:fragment>
 	
 </wicket:extend>    
 </body>

src/main/java/com/gitblit/wicket/pages/TicketPage.java

@@ -102,7 +102,6 @@ import com.gitblit.wicket.panels.CommentPanel;
 import com.gitblit.wicket.panels.DiffStatPanel;
 import com.gitblit.wicket.panels.IconAjaxLink;
 import com.gitblit.wicket.panels.LinkPanel;
-import com.gitblit.wicket.panels.ShockWaveComponent;
 import com.gitblit.wicket.panels.SimpleAjaxLink;
 
 /**
@@ -1644,12 +1643,12 @@ public class TicketPage extends RepositoryPage {
 
 	protected Fragment createCopyFragment(String wicketId, String text) {
 		if (app().settings().getBoolean(Keys.web.allowFlashCopyToClipboard, true)) {
-			// clippy: flash-based copy & paste
+			// javascript: browser JS API based copy to clipboard
 			Fragment copyFragment = new Fragment(wicketId, "clippyPanel", this);
-			String baseUrl = WicketUtils.getGitblitURL(getRequest());
-			ShockWaveComponent clippy = new ShockWaveComponent("clippy", baseUrl + "/clippy.swf");
-			clippy.setValue("flashVars", "text=" + StringUtils.encodeURL(text));
-			copyFragment.add(clippy);
+			ContextImage img = WicketUtils.newImage("copyIcon", "clippy.png");
+			// Add the ID of the target element that holds the text to copy to clipboard
+			img.add(new SimpleAttributeModifier("data-clipboard-text", text));
+			copyFragment.add(img);
 			return copyFragment;
 		} else {
 			// javascript: manual copy & paste with modal browser prompt dialog