Add Entity class.
Implement EntityActor class, Drawable interface and ActorAction and
Direction enums.
Implement EntityPlayer class and add base character sprite sheet.
Refactor screen hierarchy so that subclasses of MiniRpScreen inherit
spritebatch, font and camera. Refactor so that all screens share the
same spritebatch, font and camera which is passed from the MiniRp
instance.
Modify starting resolution for desktop launcher.