Misc ui 2 (#2248)

* Create button disabled when editing
* New disabled mixin;
* Tree styling
* Fixed icons for fullscreen toggle button
* Local controls fixed for Imagery and Plots
* Range control styling updated;
* Plot styling, significant mods
* Disclosure controls improved;
* New _legacy-plots.scss file added, no longer loads legacy plot SCSS
files;
* Removed 12px crosshair cursor in legend hover;
* Inspector tree styling in plot options
* Fix z-indexing related to Overlays

src/plugins/plot/res/templates/plot-options-browse.html

@@ -20,20 +20,20 @@
  at runtime from the About dialog for additional information.
 -->
 <div ng-controller="PlotOptionsController">
-    <ul class="tree">
+    <ul class="tree c-tree">
         <h2 title="Plot series display properties in this object">Plot Series</h2>
         <li ng-repeat="series in config.series.models">
-            <span class="tree-item menus-to-left">
-                <span class='ui-symbol view-control flex-elem'
-                      ng-class="{ expanded: series.expanded }"
+            <div class="c-tree__item menus-to-left">
+                <span class='c-disclosure-triangle is-enabled flex-elem'
+                      ng-class="{ 'c-disclosure-triangle--expanded': series.expanded }"
                       ng-click="series.expanded = !series.expanded">
                 </span>
                 <mct-representation
-                        class="rep-object-label"
+                        class="rep-object-label c-tree__item__label"
                         key="'label'"
                         mct-object="series.oldObject">
                 </mct-representation>
-            </span>
+            </div>
             <ul class="grid-properties" ng-show="series.expanded">
                 <li class="grid-row">
                     <div class="grid-cell label"