Fixes #54. Removed TransfromVelocity scripts that were heavily affecting performance with many NPCs active. Applying character's overall velocity to the ragdoll's bones instead. Ragdoll movement at spawn not visibly any worse than before (quite possibly better).
Merging in major refactoring of Character, with partially complete work on NPC support. AI stuff is incomplete and probably buggy but existing character stuff (i.e. what the game actually uses at the moment) should hopefully be stable and run the same as before.