[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/features/plot/res/templates/plot.html

@@ -119,7 +119,7 @@
                     <span class="ui-symbol icon">I</span>
                 </a>
 
-                <div class="menu-element s-menu menus-to-left"
+                <div class="menu-element s-menu-btn menus-to-left"
                      ng-if="plot.getModeOptions().length > 1"
                      ng-controller="ClickAwayController as toggle">