factorizing the graphic texture code into GraphicsAL

modified:   src/entity/LivingEntity.java
modified:   src/entity/npc/Zombie.java
modified:   src/entity/player/Player.java
modified:   src/game/GameLoop.java
modified:   src/item/weapon/LaserRifle.java
modified:   src/rendering/Background.java
modified:   src/utils/GraphicsAL.java