Implemented StateFlags with EnumSet to Creature.
Type to Set instead of explicit EnumSet.
Removed bit values because they're now obsolete as we're using EnumSet to store these StateFlags.
Removed an unused import
Added TilePropertyFlags to TileLayer classes.
Include enum class name when using flags.
Merge branch 'flags'

Conflicts:
	core/src/wge3/game/entity/creatures/Creature.java