Added an RK4 integrator class that is now being used for hector gravity.
Modified integrator to use vectors and points.
Got friction working kind of. It should be a per PhysicalObject thing, but hectors do not currently know what they are walking on, so that's going to be a bit more involved.
I think this is closer to realistic friction
The hectors XZ velocity should be adjusted when hitting a wall, so that the hector will not slide around corners on slippery surfaces or change direction in midair if a jump includes sliding off a wall.
In order for it to be easier to jump onto blocks from right in front of them, there is a tiny amount of friction in air so you can kind of move in air. Apparently avara did this?
Merge branch 'master' of http://github.com/jonathanvoss/pavara