update preview action to use new action registry

* Support category arrays for legacy actions

* Fixed object path listener. Removed old context menus

* Removed old fullscreen action and Screenfull dependency

* Restore confirmation dialog on remove

* Restored tests

* Remove unused legacy policies

* WIP re-implementation of Preview action

* WIP for Charles to take a look at flex issues

* Disable legacy preview action

* Style and markup fixes for new Preview

- LegacyViewProvider modded to wrap legacy elements in .u-contents div;
- Added selector that automatically defines display: contents on
`no-class` divs injected into __object-view;
- Unit tested with legacy and new components (telem tables, plot view,
Notebook, etc.)

* Tweak z-indexes, fix open in new tab action, add 'done' button

* Removed legacy action

* reuse contextMenuDropDown component

src/api/contextMenu/ContextMenuAPI.js

@@ -73,8 +73,12 @@ class ContextMenuAPI {
      * @private
      */
     _showContextMenuForObjectPath(objectPath, x, y) {
-        let applicableActions = this._allActions.filter(
-            (action) => action.appliesTo(objectPath));
+        let applicableActions = this._allActions.filter((action) => {
+            if (action.appliesTo === undefined) {
+                return true;
+            }
+            return action.appliesTo(objectPath);
+        });
 
         if (this._activeContextMenu) {
             this._hideActiveContextMenu();