Welcome screen, refactor to allow zero documents, and add TS typing to widgets (#702)

* unfinished implementation

* Add frontend for the empty panel screen

* Add an icon for Folder based on NodeFolder

* fixed messages causing peicees of ui not to render on new document

* Standardize nextTick syntax

* WIP generisization of component subscriptions (not compiling yet)

* Fix crash when loading font and there is no active document

* Only advertise tool actions with a document

* Fix failure to create new document

* Initalise the properties panel

* Fix highlight tab, canvas jump, warns and layer tree

* Fix tests

* Possibly fix some things?

* Move WorkingColors layout definition to backend

* Standardize action macro formatting

* Provide typing for widgets in TS/Vue and associated cleanup

* Fix viewport positioning initialization

* Fix menu bar init at startup not document creation

* Fix no viewport bounds bug

* Change !=0 to >0

* Simplify the init system

Closes #656

Co-authored-by: Keavon Chambers <keavon@keavon.com>
Co-authored-by: 0hypercube <0hypercube@gmail.com>

frontend/src/state-providers/fullscreen.ts

@@ -1,7 +1,9 @@
 import { reactive, readonly } from "vue";
 
+import { Editor } from "@/wasm-communication/editor";
+
 // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
-export function createFullscreenState() {
+export function createFullscreenState(_: Editor) {
 	const state = reactive({
 		windowFullscreen: false,
 		keyboardLocked: false,