[Frontend] Significant mods to main layout strategy

open #90
IN-PROGRESS
To support desired edge-to-edge styling of Inspector pane;
Removed superflous .scss file;
Enhancements to splitter .scss to allow flush edging and
edge shadows;

platform/commonUI/general/res/templates/object-inspector.html

@@ -20,6 +20,7 @@
  at runtime from the About dialog for additional information.
 -->
 <span class="l-inspect" ng-controller="ObjectInspectorController as controller">
+    <div class="abs holder holder-inspector-elements">
     <div class="pane-header">Inspection</div>
     <ul>
         <li>
@@ -58,4 +59,5 @@
             </span>
         </li>
     </ul>
+    </div>
 </span>