Level Loader

Needed to add in the exit for the levels, to set the basic goal. Once that's in you need somewhere to go. Built a basic level switcher to cover that functionality. It's definitely temporary code. I wouldn't want to have the level switcher be something maintained for ten or more levels, but it's fine for now and works quickly against the code I have today. It's easy to modify and expand while I'm testing and can be easily discarded for a better solution in the future, if I choose to chase one down.