#45 Break pmove out to game/cgame. This prompted me to refactor all of the client-side collision code such as R_Trace and R_PointContents, which are gone. Cl_PointContents and Cl_Trace now provide more complete and correct implementations by factoring in bounded-box entities and supporting the 'skip' entity. I also noticed along the way that Sv_Trace used a different ordering of parameters from Cm_Trace, which is retarded. That rippled through to the game code, which was unfortunate. So that's all fixed now too.