- Reduce duplication with loadWebComponent() by making it a function & exporting

- Start to implement readonly attribute

api/js/etemplate/et2_core_inputWidget.ts

@@ -415,6 +415,10 @@ export const Et2InputWidget = <T extends Constructor>(superClass: T) =>
 		{
 			return {
 				...super.properties,
+				readonly: {
+					type: Boolean,
+					reflect: true
+				},
 				value: {attribute: false}
 			};
 		}