Changing the Laser handling

modified:   Light.java
	only stores a color, whether it is active and dynamic
new file:   PointLight.java
	represents what light was before but now inheritate from light

modified:   ../environment/room/TestRoom.java
modified:   ../game/GameLoop.java
modified:   Laser.java
modified:   LightManager.java
	changed accordingly
Merge branch 'buffers' into laser

Conflicts:
	src/environment/room/TestRoom.java
	src/game/GameLoop.java
	src/light/LightManager.java

modified:   ../environment/Map.java
	lasers do not compute shadows anymore to be fixed in a later commit