[Feature] Updates to inventory icons, context menus, action use, and observer visibility (#1814)

* Update inventory controls and permissions filtering

* Also disable prosemirror editors

* Address context menu deprecation warnings

* Fix context menu detection for actions

* Refine logic for use action when hovering over item icon

templates/sheets/actors/adversary/features.hbs

@@ -6,8 +6,8 @@
             type='feature'
             collection=@root.features
             hideContextMenu=true
-            canCreate=true
-            showActions=true
+            canCreate=@root.editable
+            showActions=@root.editable
         }}
     </div>
 </section>