First pass at importing PhysicsFPSWalker
Second pass, using RigidbodyFPSWalker
SmoothMouseLook
Handling cursor lock
Bug in lock cursor; boggling organization in SmoothMouseLook
Fixed some questionable decisions made in SmoothMouseLook

Really, you let you rotation go to a hugely negative value?! Yeah, that won't screw me over while I move my mouse over and over and over and over trying to look up again