Moved DefaultLevelGenerator from world namespace into project namespace
TowerSelector no longer hides after selecting a tower
Shapes now properly render again

Changed GameplayScreen.getLevelActor to a private LevelActor class. This LevelActor class now handles the drawing for the Actor.
Moved all the separate Actors in GameplayScreen into classes as opposed to funtions
Merge branch 'master' of https://github.com/siketh/COP4331_Project