Make property editor display dictionaries (read only)

(cherry picked from commit a542372642f873b9e85566b8168a5af4f2465957)

editor/property_editor.cpp

@@ -2990,6 +2990,13 @@ void PropertyEditor::update_tree() {
 				if (show_type_icons)
 					item->set_icon(0, get_icon("ArrayData", "EditorIcons"));
 
+			} break;
+			case Variant::DICTIONARY: {
+
+				item->set_cell_mode(1, TreeItem::CELL_MODE_STRING);
+				item->set_editable(1, false);
+				item->set_text(1, obj->get(p.name).operator String());
+
 			} break;
 
 			case Variant::INT_ARRAY: {