Add 'Zoom with Scroll' input navigation scheme to preferences (#1021)

* Add use_scroll_as_zoom field to preference handler

* Add {Create,Delete}Mapping variants to message

* Revert "Add {Create,Delete}Mapping variants to message"

This reverts commit 0ba74754c9fb0c78d0b590c96e1d4fe2cfdd13e7.

* Revert "Add use_scroll_as_zoom field to preference handler"

This reverts commit d30f7c9edfa6d6e156939ca07f4db81f288975fd.

* Add basic scroll_as_zoom mapping

* Create overengineered mapping patch abstraction

* Add (for now passthrough) input layout manager

* Actually handle ModifyLayout messages (untested)

* Add backend preferences <-> layout manager comms

* Add scroll-as-zoom to actual preferences UI

* Rename LayoutManager -> KeyMapping

* Add Input section to preferences and title case

* Add scrollAsZoom frontend handling code (untested)

* Handle frontend <-> preferences comms

* (broken) Move scrollAsZoom persistence into state

* Fix scrollAsZoom having no effect on node graph

* Remove debugging helpers

* Fix confusion between horizontal and vertical

* Rename feature

* Move new message handler into folder

---------

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

frontend-svelte/src/wasm-communication/messages.ts

@@ -53,6 +53,10 @@ export class UpdateOpenDocumentsList extends JsMessage {
 	readonly openDocuments!: FrontendDocumentDetails[];
 }
 
+export class UpdateZoomWithScroll extends JsMessage {
+	readonly zoomWithScroll!: boolean;
+}
+
 // Allows the auto save system to use a string for the id rather than a BigInt.
 // IndexedDb does not allow for BigInts as primary keys.
 // TypeScript does not allow subclasses to change the type of class variables in subclasses.
@@ -1432,6 +1436,7 @@ export const messageMakers: Record<string, MessageMaker> = {
 	UpdateOpenDocumentsList,
 	UpdatePropertyPanelOptionsLayout,
 	UpdatePropertyPanelSectionsLayout,
+	UpdateZoomWithScroll,
 	UpdateToolOptionsLayout,
 	UpdateToolShelfLayout,
 	UpdateWorkingColorsLayout,