Fixed over 500 compile warnings. Mostly:

* Unused variables.
* Missing newlines at ends of #included files.
* signed int loop variables where the termination condition is an unsigned 'get number of' function.
* 'NULL' used inappropriately for an integer or character constant (NULL is a pointer)
* abstract base classes with no virtual destructor.
* Floating point constants used to initialise integer variables.

BulletDynamics/Vehicle/RaycastVehicle.cpp

@@ -257,8 +257,6 @@ void RaycastVehicle::UpdateVehicle( SimdScalar step )
 	for (wheelIt = m_wheelInfo.begin();
 	!(wheelIt == m_wheelInfo.end());wheelIt++,i++)
 	{
-		WheelInfo& wheelInfo = *wheelIt;
-		
 		SimdScalar depth; 
 		depth = Raycast( *wheelIt );
 	}