Added support for dynamic mail labels/tags management.

The CSS in the UIxPreferences remains to be done.

UI/Templates/MailerUI/UIxMailMainFrame.wox

@@ -16,6 +16,10 @@
     var unseenCountFolders = <var:string value="unseenCountFolders" const:escapeHTML="NO"/>;
   </script>
   <style type="text/css">
+  <var:foreach list="availableLabels" item="currentLabel">
+    #label-menu LI.<var:string value="currentLabel.name"/>
+    { color: <var:string value="currentLabel.color"/>; }
+  </var:foreach>  
   <var:if condition="horizontalDragHandleStyle">
     DIV#verticalDragHandle, DIV#rightPanel
      { left: <var:string value="horizontalDragHandleStyle" />; }
@@ -170,11 +174,9 @@
     <ul id="" class="choiceMenu">
       <li><var:string label:value="None" /></li>
       <li><!-- separator --></li>
-      <li class="label1"><var:string label:value="Important" /></li>
-      <li class="label2"><var:string label:value="Work" /></li>
-      <li class="label3"><var:string label:value="Personal" /></li>
-      <li class="label4"><var:string label:value="To Do" /></li>
-      <li class="label5"><var:string label:value="Later" /></li>
+      <var:foreach list="availableLabels" item="currentLabel">
+        <li var:class="currentLabel.name" var:data-name="currentLabel.name">  <var:string value="currentLabel.label"/></li>
+      </var:foreach>
     </ul>
   </div>