Various updates include multiplayer gunnery positions on a/c

This version adds:

1. New pilot head models

2. Rear machine gun is guarded against shooting your own a/c. This is similar to the way you can't shoot your own propellor.

3. New aerodynamic improvements to Hansa

4. Joining as a gunner in multiplayer
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Once you have begun hosting or have joined a game, go to the in-game menu and select the gunner icon.

Use Select or Return to cycle through the available aircraft.