Simulate grab/hover/stretch-end when object is removed by user

src/components/remove-networked-object-button.js

 AFRAME.registerComponent("remove-networked-object-button", {
   init() {
-    this.onClick = () => {
+    this.onClick = e => {
       if (!NAF.utils.isMine(this.targetEl) && !NAF.utils.takeOwnership(this.targetEl)) return;
 
+      // HACK currently superhands does not simulate a grab-end or a hover-end
+      // when an object is removed, so we do it here for now to ensure any
+      // super hands who have this element are cleared.
+      this.targetEl.dispatchEvent(new window.CustomEvent("stretch-end", e));
+      this.targetEl.dispatchEvent(new window.CustomEvent("hover-end", e));
+      this.targetEl.dispatchEvent(new window.CustomEvent("grab-end", e));
+
       this.targetEl.parentNode.removeChild(this.targetEl);
     };