Added erase many and place many canvas undo

src/CanvasComponents/CanvasComponentContainer.cpp

@@ -45,6 +45,10 @@ void CanvasComponentContainer::register_class(World& w) {
     });
 }
 
+void CanvasComponentContainer::reassign_netobj_ids_call() {
+    compAllocator.reassign_ids();
+}
+
 std::unique_ptr<CanvasComponentContainer::CopyData> CanvasComponentContainer::get_data_copy() const {
     auto toRet = std::make_unique<CanvasComponentContainer::CopyData>();
     toRet->coords = coords;