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.

Demos/OpenGL/GL_ShapeDrawer.cpp

@@ -151,7 +151,6 @@ void GL_ShapeDrawer::DrawOpenGL(float* m, const CollisionShape* shape, const Sim
 			case TRIANGLE_SHAPE_PROXYTYPE:
 			case TETRAHEDRAL_SHAPE_PROXYTYPE:
 				{
-					const BU_Simplex1to4* tetra = static_cast<const BU_Simplex1to4*>(shape);
 					//todo:	
 //					useWireframeFallback = false;
 					break;