Easter Egg from Android Nougat

Oct 2, 2018

Added ability to change how cats are sorted:
- Classic sorting from "Android 7.0".
- Body hue sorting in "Android 7.1". This has been the default so far.
- "Name" might help with giving your cats unique names!? =^_^=
- "Level"? Cats have levels???
Also trying to fix issues that are reasonably fixable.