Store user settings/data on the server and multi user support (#2160)

* wip per user data

* Rename, hide menu

* better error
rework default user

* store pretty

* Add userdata endpoints
Change nodetemplates to userdata

* add multi user message

* make normal arg

* Fix tests

* Ignore user dir

* user tests

* Changed to default to browser storage and add server-storage arg

* fix crash on empty templates

* fix settings added before load

* ignore parse errors

web/scripts/ui/spinner.js

@@ -0,0 +1,9 @@
+import { addStylesheet } from "../utils.js";
+
+addStylesheet(import.meta.url);
+
+export function createSpinner() {
+	const div = document.createElement("div");
+	div.innerHTML = `<div class="lds-ring"><div></div><div></div><div></div><div></div></div>`;
+	return div.firstElementChild;
+}