[Frontend] Time Controller Markup and Styling

open #1515
open #117
Significant re-org in menus.scss continued:
Refactored s-menu to s-menu-btn;
moved look-related style def's into .s-menu;
.menu now extends .s-menu;

platform/forms/res/templates/controls/menu-button.html

@@ -19,7 +19,7 @@
  this source code distribution or the Licensing information page available
  at runtime from the About dialog for additional information.
 -->
-<div class="s-menu menu-element"
+<div class="s-menu-btn menu-element"
      ng-controller="ClickAwayController as toggle">
 
     <span class="l-click-area" ng-click="toggle.toggle()"></span>