Adds rectangles that fall from the sky

Got ODE installed and working.

To install, get the latest source from wherever you can find it and follow the directions to compile and install it.  Installation of this is surprisingly easy, which is why I picked it over Bullet Physics.

As the title states, everything in the game is now tied into the physics simulation.  Nothing collides yet (seemingly), I'm still working on that.

I also added a prototype system so I can easily through different object classes into the game sim without bothering with making a new class.  Hell yeah data oriented design.

Also fixed a bug where the game loop would copy objects, modify them, and discard the changes.