Event Quest Editor + Offline Usage

In preparation of the next Erupe update which moves the Event Quests stuff to the Database, i made a small Editor to manage them.
Also i now store every CSS/JS dependency locally which means, that you can use the manager offline.
Nice benefit, this will also speed up the manager generally.

If you encounter errors visiting the new Event Quest Editor, you probably don't have the latest dev build of erupe / the feature is not yet released.

Full Changelog: 1.7.5...1.8.0