Add drag-and-drop and copy-paste file importing/opening throughout the UI (#2012)

* Add file importing by dragging and dropping throughout the UI

* Disable comment-profiling-changes.yaml

* Fix CI

editor/src/messages/dialog/new_document_dialog/new_document_dialog_message_handler.rs

@@ -34,6 +34,8 @@ impl MessageHandler<NewDocumentDialogMessage, ()> for NewDocumentDialogMessageHa
 
 				responses.add(NodeGraphMessage::RunDocumentGraph);
 				responses.add(NodeGraphMessage::UpdateNewNodeGraph);
+
+				// TODO: Figure out how to get StartBuffer to work here so we can delete this and use `DocumentMessage::ZoomCanvasToFitAll` instead
 				responses.add(Message::StartBuffer);
 				responses.add(FrontendMessage::TriggerDelayedZoomCanvasToFitAll);
 			}