Replaced the FCKeditor with the new CKeditor v4. Implemented a plugin that allows dragging and dropping one or more files into the CKeditor - plugin name is dndfiles. Modified the save toolbar button on the CKeditor so that it behaves like a submit button. Implemented a timestamp plugin that behaves the same way as the old timestamp button on FCKeditor. Added a plugin to the CKeditor that allows typing LaTeX syntax.

scripts/ckeditor/plugins/about/plugin.js

@@ -0,0 +1,25 @@
+/**
+ * @license Copyright (c) 2003-2014, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md or http://ckeditor.com/license
+ */
+
+CKEDITOR.plugins.add( 'about', {
+	requires: 'dialog',
+	lang: 'af,ar,bg,bn,bs,ca,cs,cy,da,de,el,en,en-au,en-ca,en-gb,eo,es,et,eu,fa,fi,fo,fr,fr-ca,gl,gu,he,hi,hr,hu,id,is,it,ja,ka,km,ko,ku,lt,lv,mk,mn,ms,nb,nl,no,pl,pt,pt-br,ro,ru,si,sk,sl,sq,sr,sr-latn,sv,th,tr,tt,ug,uk,vi,zh,zh-cn', // %REMOVE_LINE_CORE%
+	icons: 'about', // %REMOVE_LINE_CORE%
+	hidpi: true, // %REMOVE_LINE_CORE%
+	init: function( editor ) {
+		var command = editor.addCommand( 'about', new CKEDITOR.dialogCommand( 'about' ) );
+		command.modes = { wysiwyg: 1, source: 1 };
+		command.canUndo = false;
+		command.readOnly = 1;
+
+		editor.ui.addButton && editor.ui.addButton( 'About', {
+			label: editor.lang.about.title,
+			command: 'about',
+			toolbar: 'about'
+		} );
+
+		CKEDITOR.dialog.add( 'about', this.path + 'dialogs/about.js' );
+	}
+} );