[Fronted] Significant refactoring of mixins for containers and buttons

WTD-839
Removal of 'icon-btn' class from *.html;
Cleanup of markup in switcher.html;
'name' span is now hidden when switcher is within frame;
Commented out unused css classes in _controls.scss,
Normalization of markup in object header when in main view and framed objects;
Icon sizing fixed in menus and switcher control;
Tightened up spacing in menus;

platform/commonUI/general/res/sass/controls/_buttons.scss

@@ -25,7 +25,7 @@ $pad: $interiorMargin * $baseRatio;
 /******* LAYOUT AND SIZING */
 .btn,
 .l-btn {
-	line-height: 1.2em;
+	line-height: 1.25em;
 	padding: 0 $pad;
 	text-decoration: none;
 	&.lg,