Loads a constant from the config file.
Removes constants from GameLoop and introduces items code.
Merge remote-tracking branch 'origin/game-files' into map-creation
merge map-creation and game-files
Conflicts:
	src/main/scala/ayai/apps/GameLoop.scala
	src/main/scala/ayai/networking/NetworkMessageProcessor.scala
	src/main/scala/ayai/systems/MovementSystem.scala