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

@@ -108,7 +108,7 @@
                         <span class="ui-symbol icon">I</span>
                     </a>
 
-                    <div class="menu-element btn icon-btn s-very-subtle btn-menu dropdown click-invoke"
+                    <div class="menu-element btn s-very-subtle btn-menu dropdown menus-to-left"
                          ng-if="plot.getModeOptions().length > 1"
                          ng-controller="ClickAwayController as toggle">