Nested networks UI (#885)

* Initial UI for nested nodes

* Clean up deleting nodes

* Print address of nested network

* Add exiting network message

* Implement the breadcrumb trail

* Remove whitespace

* Fix double click not registering in Chromium

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

editor/src/messages/frontend/frontend_message.rs

@@ -215,6 +215,11 @@ pub enum FrontendMessage {
 		nodes: Vec<FrontendNode>,
 		links: Vec<FrontendNodeLink>,
 	},
+	UpdateNodeGraphBarLayout {
+		#[serde(rename = "layoutTarget")]
+		layout_target: LayoutTarget,
+		layout: SubLayout,
+	},
 	UpdateNodeGraphVisibility {
 		visible: bool,
 	},