Sliding

Ok, I think I'm done with collision for now. It could use a bit more tweaking to prevent you from walking up nearly vertical walls and such, but I don't think I'll need any non-vertical walls anyway.

I'm not really sure what to do next though. I suppose it's time for a list.

- Character structures and a list for updating them.
- Build an enemy model, with idle, walk and shoot animations.
- Shooting controls and hit detection (so much for being done with collision).
- Proper velocity based physics and jumping.
- Health and ammo pickups.
- Some way of defining enemy and item placement in levels.

That ought to be enough to stay busy for a while.