Persist User preference widths for MCTSplitPane

Fix to Issue #1646
Persist MCTSplitPane widths to local storage, thus when user reloads, the Panes maintain dimensions
Use persisted widths if available otherwise use default
Add tests for localStorage and fix failing tests

platform/commonUI/browse/res/templates/browse.html

@@ -26,7 +26,7 @@
          ng-controller="PaneController as modelPaneTree"
          ng-class="modelPaneTree.visible() ? 'pane-tree-showing' : 'pane-tree-hidden'">
         <mct-split-pane class='abs contents'
-                        anchor='left'>
+                        anchor='left' alias="leftSide">
             <div class='split-pane-component treeview pane left'>
                 <div class="abs holder l-flex-col holder-treeview-elements">
                     <mct-representation key="'create-button'"
@@ -60,7 +60,7 @@
                      ng-controller="InspectorPaneController as modelPaneInspect"
                      ng-class="modelPaneInspect.visible() ? 'pane-inspect-showing' : 'pane-inspect-hidden'">
 
-                    <mct-split-pane class='l-object-and-inspector contents abs' anchor='right'>
+                    <mct-split-pane class='l-object-and-inspector contents abs' anchor='right' alias="rightSide">
                         <div class='split-pane-component t-object pane primary-pane left'>
                             <mct-representation mct-object="navigatedObject"
                                                 key="navigatedObject.getCapability('status').get('editing') ? 'edit-object' : 'browse-object'"
@@ -87,4 +87,3 @@
     </div>
     <mct-include key="'bottombar'"></mct-include>
 </div>
-