adding support for wcm tinymce extensions to create html from web content wizard

- extracted file picker backing code into its own bean
- refactoring for to extract file picker bean
- refactoring to manage uploads from file picker outside of xforms context
- added some language utility methods to common.js
- refactored extension dialogs to deal with quirkyness of tinymce dialog codebase on IE - mostly works now and addressed bug WCM-471
- resourcifying a couple strings i missed in filepickerbean

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@5675 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/web/scripts/ajax/common.js

@@ -283,4 +283,35 @@ function log(message)
    var logLine = log.window_.document.createElement("div");
    logLine.appendChild(log.window_.document.createTextNode(message));
    log.window_.document.body.appendChild(logLine);
-}
+}
+
+if (!String.prototype.startsWith)
+{
+  String.prototype.startsWith = function(s)
+  {
+    return this.indexOf(s) == 0;
+  }
+}
+
+if (!Array.prototype.indexOf)
+{
+  Array.prototype.indexOf = function(o)
+  {
+    for (var i = 0; i < this.length; i++)
+    {
+      if (this[i] == o)
+      {
+        return i;
+      }
+    }
+    return -1;
+  }
+}
+
+if (!Array.prototype.peek)
+{
+  Array.prototype.peek = function(o)
+  {
+    return this[this.length - 1];
+  }
+}