[FA]{other} I14 Simple Lighting

#14

Implemented ambient light and simple light on the player based on
https://github.com/libgdx/box2dlights/wiki/How-To
Merge branch 'fadler_dev' of https://github.com/fadler/sw14_free_27 into fadler_dev

Conflicts:
	core/src/at/adlerbros/sneakquest/screens/Play.java
[FA]{other} I14 - Simple Lighting

#14
-Changed Screens to have "Screen" at the end of the class / file name
-> updated references accordingly
-Removed player light and added a cone and point light to each enemy
-Changed game over condition from an enemy touching the player to the
player center being in one of the enemy lights
-Some small PlayScreen refactoring