dispose resources
We got maps! the maps even have proper offset, demongates, wall, etc. and you can place units initially on it based on map position! (for spawning)
Merge commit 'c7af9bb'

Conflicts:
	core/src/main/java/com/vdxp/demon_front/core/SpriteTestScreen.java
	core/src/main/java/com/vdxp/demon_front/core/units/Hero.java
	core/src/main/java/com/vdxp/demon_front/core/units/Unit.java