Add "Make Path Editable" buttons in the Path tool control bar and Layer menu (#2900)

* Add graph message for adding a path

* Disable options when adding path tool is not possible

* Move Layer menu entry location

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

editor/src/messages/portfolio/menu_bar/menu_bar_message_handler.rs

@@ -19,6 +19,7 @@ pub struct MenuBarMessageHandler {
 	pub spreadsheet_view_open: bool,
 	pub message_logging_verbosity: MessageLoggingVerbosity,
 	pub reset_node_definitions_on_open: bool,
+	pub single_path_node_compatible_layer_selected: bool,
 }
 
 #[message_handler_data]
@@ -45,6 +46,7 @@ impl LayoutHolder for MenuBarMessageHandler {
 		let message_logging_verbosity_names = self.message_logging_verbosity == MessageLoggingVerbosity::Names;
 		let message_logging_verbosity_contents = self.message_logging_verbosity == MessageLoggingVerbosity::Contents;
 		let reset_node_definitions_on_open = self.reset_node_definitions_on_open;
+		let single_path_node_compatible_layer_selected = self.single_path_node_compatible_layer_selected;
 
 		let menu_bar_entries = vec![
 			MenuBarEntry {
@@ -418,9 +420,8 @@ impl LayoutHolder for MenuBarMessageHandler {
 							disabled: no_active_document || !has_selected_layers,
 							children: MenuBarEntryChildren(vec![{
 								let list = <BooleanOperation as graphene_std::registry::ChoiceTypeStatic>::list();
-								list.into_iter()
-									.map(|i| i.into_iter())
-									.flatten()
+								list.iter()
+									.flat_map(|i| i.iter())
 									.map(move |(operation, info)| MenuBarEntry {
 										label: info.label.to_string(),
 										icon: info.icon.as_ref().map(|i| i.to_string()),
@@ -436,6 +437,14 @@ impl LayoutHolder for MenuBarMessageHandler {
 							..MenuBarEntry::default()
 						},
 					],
+					vec![MenuBarEntry {
+						label: "Make Path Editable".into(),
+						icon: Some("NodeShape".into()),
+						shortcut: None,
+						action: MenuBarEntry::create_action(|_| NodeGraphMessage::AddPathNode.into()),
+						disabled: !single_path_node_compatible_layer_selected,
+						..MenuBarEntry::default()
+					}],
 				]),
 			),
 			MenuBarEntry::new_root(