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.

Bullet/CollisionShapes/ConvexShape.cpp

@@ -15,11 +15,6 @@ subject to the following restrictions:
 
 #include "ConvexShape.h"
 
-ConvexShape::~ConvexShape()
-{
-
-}
-
 ConvexShape::ConvexShape()
 :m_collisionMargin(CONVEX_DISTANCE_MARGIN),
 m_localScaling(1.f,1.f,1.f)