Add destroy method to DeviceManager module

src/device_manager/index.js

@@ -124,6 +124,14 @@ export default () => {
      */
     render() {
       return view.render().el;
+    },
+
+    destroy() {
+      devices.reset();
+      devices.stopListening();
+      view.remove();
+      [devices, view].forEach(i => (i = null));
+      c = {};
     }
   };
 };

src/editor/model/Editor.js

@@ -762,7 +762,8 @@ export default Backbone.Model.extend({
       AssetManager,
       BlockManager,
       CodeManager,
-      Commands
+      Commands,
+      DeviceManager
     } = this.attributes;
     this.stopDefault();
     DomComponents.clear();
@@ -777,6 +778,7 @@ export default Backbone.Model.extend({
     BlockManager.destroy();
     CodeManager.destroy();
     Commands.destroy();
+    DeviceManager.destroy();
     this.view.remove();
     this.stopListening();
     this.clear({ silent: true });