implementing Inventory

new file:   src/inventory/Inventory.java
	new: add
	new: remove
	new: getWeight
	new: getIdx
	new: draw

modified:   src/item/Item.java
	bew: getWeight
further inventory implementation
	LivingEntity now has an inventory
	the Inventory is displayed when pressing "i"
	more work needs to be done for the appearance of the inventory

modified:   src/entity/LivingEntity.java
modified:   src/entity/npc/LivingEntityManager.java
modified:   src/entity/npc/Npc.java
modified:   src/entity/npc/Zombie.java
modified:   src/entity/player/Player.java
modified:   src/event/control/PlayerControl.java
modified:   src/game/GameLoop.java
modified:   src/inventory/Inventory.java
modified:   src/userInterface/OverlayManager.java
modified:   src/userInterface/PlayerStatsOverlay.java
prettier inventory display not functional yet
toward the handling of specific item textures

modified:   src/entity/player/Player.java
modified:   src/game/GameLoop.java
modified:   src/inventory/Inventory.java
modified:   src/item/Item.java
modified:   src/item/weapon/LaserRifle.java
tiny bug fixing and moving inventory
modified:   src/item/weapon/LaserRifle.java
renamed:    src/inventory/Inventory.java -> src/userInterface/Inventory.java
fixing a dependance issue

modified:   src/entity/LivingEntity.java
trying to handle textures in LaserRifle

modified:   src/item/weapon/LaserRifle.java
handling laserRifle texture in Inventory

new file:   assets/textures/laserRifle.png
modified:   src/game/GameLoop.java
modified:   src/item/weapon/LaserRifle.java
modified:   src/rendering/TextureManager.java
modified:   src/userInterface/Inventory.java
prettier inventory

modified:   assets/textures/laserRifle.png
modified:   src/item/weapon/LaserRifle.java
modified:   src/userInterface/Inventory.java
buggy version of items drawn on map

modified:   src/entity/player/Player.java
modified:   src/environment/Map.java
modified:   src/environment/room/Room.java
modified:   src/environment/room/SpawnRoom.java
modified:   src/game/GameLoop.java
modified:   src/item/Item.java
modified:   src/item/weapon/LaserRifle.java
modified:   src/item/weapon/Weapon.java
modified:   src/userInterface/Inventory.java
fixing the bug