background for built-in loading screen
basic combat
Fog of war with transparency
Fog of war with transparency
Merge commit 'f724db37149002ca2b25fc1f3447f5510c01dabd'

Conflicts:
	core/src/main/java/com/vdxp/demon_front/core/Drawable.java
	core/src/main/java/com/vdxp/demon_front/core/SpriteTestScreen.java
	core/src/main/java/com/vdxp/demon_front/core/map/MapTile.java