Configurable cache directory

[Buckminsterfullerene02]

[Draft]

Reason for implementation

If the user changes cache dir, it needs to delete the existing cache from the previous location and make the directory at the new location. I'm not having it copy the cache dir because it's usually multiple GBs which can be a long ass process for slower machines. Would need extra complexity like progress bar or something. Saying that, deleting multiple GBs can take a while too so maybe not have that part? Then again, it's expected to delete old cache files anyway

Have not been able to actually test this code yet (aside from the UI changes)