Room dialog (#905)

* support ToolIcon className and fix label padding

* factor some ExportDialog classes out to Modal

* initial RoomDialog prototype

* change label for another-session button

* remove unused css

* add color comments

* Move the collaboration button to the main menu, add support for mobile

* remove button for creating another session

* add locks

* Fix alignment issue

* Reorder button

* reuse current scene for collab session

* keep collaboration state on restore

Co-authored-by: Jed Fox <git@twopointzero.us>

src/appState.ts

@@ -1,6 +1,5 @@
 import { AppState, FlooredNumber } from "./types";
 import { getDateTime } from "./utils";
-import { getCollaborationLinkData } from "./data";
 
 const DEFAULT_PROJECT_NAME = `excalidraw-${getDateTime()}`;
 export const DEFAULT_FONT = "20px Virgil";
@@ -28,7 +27,7 @@ export function getDefaultAppState(): AppState {
     cursorY: 0,
     scrolledOutside: false,
     name: DEFAULT_PROJECT_NAME,
-    isCollaborating: !!getCollaborationLinkData(window.location.href),
+    isCollaborating: false,
     isResizing: false,
     selectionElement: null,
     zoom: 1,