T-34-85 Tank breakdown - single piece hull

This is a remix of chanson836's remix of m_bergman's T-34-85.

chanson836's remix split m_bergman's original model into separate pieces for easy printing.

I found that I had problems making the three separate hull pieces fit seamlessly after printing, so I recombined the three hull pieces into a single piece. I also preferred the original turret design, where the turret top and bottom were contained in a single piece.

Print the tracks lying down, wheels up, and the hull oriented botto