Enhancement: Smoother motion using last known acceleration values

[fore5fire]

Maybe making position estimates non-collidable to avoid accidental ramming due to lag.

[TehGimp]

I'll experiment with this when I get a chance to see if it yields a better gameplay experience--I imagine we can make this work with the current architecture but would want to reduce the magnitude of incoming acceleration values (ala current flight control handling) given KMP's low tickrate. This issue may also be addressed by increasing the KMP tickrate based on situation in order to provide better overall position/velocity resolution.