[Feature] Clear Cache from Settings

[Zunawe]

Pretty minor thing. Gelli has some cached album art that I changed about a month ago; the art displays correctly on the jellyfin web viewer but it's still the old one on gelli. I'd like to be able to clear the cache to force it to update. Right now my only options are to clear the cache in my phone's settings or lower the cache size and hope the album is in the part that gets deallocated.