Move timestep into world init, since it's usually always the same.
Allow any length vector to become a b2Vec2.
Expose a couple more Box2D functions.
Make b2_getangle return degrees, as per the rest of lobster.
Add wireframe rendering toggle.
Add rather bare XInput support.
Add const.
Fix suspicious DECRT.
Add various new builtins.
Remove trailing ---8<--- from TTY separator.

This makes it easier to copy and paste the command line into VC++ when
it's time to debug.