[Display Layout] Allow multiple selection, duplication, and changing types (#3083)

* enable multiple selection

* enable object duplication

* enable copy styles

* enable converting plots and tables to alpha numerics

* enable merging multiple alpha numerics

* change icon for viewSwitcher

* allow users to merge overlay plots into a stacked plot

* New glyph for alphanumeric

Co-authored-by: charlesh88 <charlesh88@gmail.com>

src/plugins/displayLayout/components/BoxView.vue

@@ -91,6 +91,13 @@ export default {
             }
 
             this.context.index = newIndex;
+        },
+        item(newItem) {
+            if (!this.context) {
+                return;
+            }
+
+            this.context.layoutItem = newItem;
         }
     },
     mounted() {