Tighten the link between Options and ConfigEntries

[Arkhist]

Current implem does twice the work. Using ConfigEntries in the very beginning would make options easier to save.

[Windows10CE]

Since https://github.com/BepInEx/BepInEx/pull/267 is in the works it would probably be a good idea to hold off on this specific issue and discourage the use of the settings menu by modders till then, that PR should afford us some more flexibility in how we can integrate these config options.

We could also abstract away ConfigFile now and make the change transparent later, which might end up being better? Options haven't seen a ton of code written for them just yet other than the minimum for checkboxes, so if we decide to go that route now would be the time