Fixed warnings in Bullet/src core library

Thanks Martijn Reuvers from Two Tribes B.V. (www.twotribes.com) for the patch

To make this work more visible, suppress warnings in external libraries in Extras (COLLADA_DOM, libxml and glui contain many warnings)
Added PreprocessorDefinitions: _CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE to vcproj files

src/BulletCollision/CollisionDispatch/btCollisionDispatcher.cpp

@@ -280,7 +280,7 @@ void* btCollisionDispatcher::allocateCollisionAlgorithm(int size)
 	}
 	
 	//warn user for overflow?
-	return	btAlignedAlloc(size,16);
+	return	btAlignedAlloc(static_cast<std::size_t>(size), 16);
 }
 
 void btCollisionDispatcher::freeCollisionAlgorithm(void* ptr)