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/utils.js

@@ -1,3 +1,5 @@
+import { $el } from "./ui.js";
+
 // Simple date formatter
 const parts = {
 	d: (d) => d.getDate(),
@@ -65,3 +67,22 @@ export function applyTextReplacements(app, value) {
 		return ((widget.value ?? "") + "").replaceAll(/\/|\\/g, "_");
 	});
 }
+
+export async function addStylesheet(urlOrFile, relativeTo) {
+	return new Promise((res, rej) => {
+		let url;
+		if (urlOrFile.endsWith(".js")) {
+			url = urlOrFile.substr(0, urlOrFile.length - 2) + "css";
+		} else {
+			url = new URL(urlOrFile, relativeTo ?? `${window.location.protocol}//${window.location.host}`).toString();
+		}
+		$el("link", {
+			parent: document.head,
+			rel: "stylesheet",
+			type: "text/css",
+			href: url,
+			onload: res,
+			onerror: rej,
+		});
+	});
+}