Updated plPXPhysicalControllerCore to match 69377bc74f2e

While based heavily on the old implementation, this is essentially a rewrite.

Notable changes -
Controllers are now updated at the same fixed frequency as the simulation.
Resulting output is interpolated between steps to precisely match the frame delta.
Physics work is only done when enough time has passed to perform a step.

The kinematic actor that followed around the controller has been removed.
The underlying kinematic actor created by the NxController is now used for triggering.
A new sim group was added for a kinematically controlled avatar.

2 unused files removed -
plPXPhysicalController.h & plPXPhysicalController.cpp

MOULOpenSourceClientPlugin/Plasma20/Sources/Plasma/PubUtilLib/plPhysX/plSimulationMgr.h

@@ -159,6 +159,7 @@ protected:
 
 	float fMaxDelta;
 	float fStepSize;
+	float fAccumulator;
 
 	// A utility class to keep track of a request for a physical synchronization.
 	// These requests must pass a certain criteria (see the code for the latest)