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Let my memory go!

The function that frees allocated memory when a C++ ruby object is no longer referenced now works. The function is called freeme and is sent to Ruby via Data_Wrap_Struct. The freeme function takes as a parameter a pointer to the actual C++ object. Ruby passes that object when ruby objects no longer reference the Ruby object that encapsulates the C++ object. Unfortunately I could not make the character control work. The md2 models didn't get imported well into Irrlicht either. Also, the physics callback allows the C++ app class to inform Ruby when a collision occurred and who collided. I will try to work more on that feature to make it more powerful.

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