Zeros now fly in formation

Zeros now (sort of) fly in formation.  I still need to improve formation flying.  

I have stopped development of the web version.  I am not knowledgable about the inner workings of the godot engine but here is my explanation why I dropped the web version.  I need to use a double precision build of the game to keep accurate position of things that are far away from the origin.  The compatability renderer does not seem to support double precision vectors so when aircraft are far away from the origin they lose precision and 'jitter'.  Also the Forward+ renderer supports a reverse z buffer, far away objects from the camera do not 'fight' for rendering order, the compatability renderer does not seem to support this either.  The web version uses the compatability renderer and this is why I must drop the web version.

Also I fixed a few bugs.

Hopefully I can start getting some actual aerial combat simulated soon.

Thanks for having a look.