Prototyping game in XNA

Switching the game core over to XNA since C# is much faster to iterate
in. Hopefully we can re-create the game rather rapidly and proceed
faster in the future. Also shinies.
Initial content pipeline support for sprite xml
The player sprite can animate a walk!
Player can move around the window
The player now walks and correctly animates!
Basic enemy AI that can look and walk around.
Script to help building sprite atlases
Much more animations + sprite atlas
Updating assets for the game
Optimizing sprite storage
Renamed and re-organized classes and namespaces

There were lots of stupid problems that needed to be fixed from
yesterday's hackathon, mostly revolving around poorly choosen
namespaces.
Slash attack animation
Sword swinging abilities
Ability to specify origin offset in sprite xml
Very handy debug renderer to draw line / rects
Starting collision detection
Rotated rectangle collisions!
Cleaning up the bounding rect class
Player can now wear equipment
Simple gameplay, smack a skeleton and kill them