Major refactoring and fixes.

* Split Node into multiple types and make sure fields are actually set
  when type says so.
* Refactor request handling.
* Start getting rid of moment as a dependency by using
  UnixTimestampSeconds instead.

server/resources/versionResource.ts

@@ -1,12 +1,6 @@
-import {success} from "../utils/resources";
+import {handleJSON} from "../utils/resources";
 import {version} from "../config";
-import {Request, Response} from "express";
 
-export function get (req: Request, res: Response): void {
-    success(
-        res,
-        {
-            version
-        }
-    );
-}
+export const get = handleJSON(async () => ({
+    version
+}));