Create basic architecture for Entities and the main game logic

[silas-hw]

Produce a basic architecture to hold the main gameplay logic, including:

• Entities
• Scene Graph
• EntityFactory
• Physics handling

[silas-hw]

I'm pretty much most of the way there, any further additions wouldn't be "creating the architecture" in my books. It would rather be refactoring and improvements. Thus the issue can be closed, my friend.

There wasn't really much of an architecture to make anyways, just my own scene graph and a physics filter bolted on top of JBump :3