Change URLs to use the JS URL constructor consistently across codebase.

Fixes #281

server/src/utils/url.ts

@@ -0,0 +1,9 @@
+export function CreateURLWithParams(url: string, params: Record<string, string>) {
+	const u = new URL(url);
+
+	for (const key in params) {
+		u.searchParams.set(key, params[key]);
+	}
+
+	return u;
+}