Begin moving in the direction of Makefile builds.

Create the initial Makefile.
Add a scad file to use as the main source for building plates.
The baffles_all.scad file only serves to create a build plate. Replace
it with the appropriate command in the new Makefile.
Continue conversion to Makefile.

Removed engines4.scad as a file that only generates a plate.
Move the code into starfury.scad and update the Makefile to match.
Move the thrusters build logic into Makefile.

Remove the unneeded plate source file (thrusters.scad).
Move body build into Makefile.

Also removed redundant nozzle definition from engine.scad file.
Move stand build into Makefile.
Now the struts are construtable from Makefile.
Update the readme to remove unneeded files.
Remove unnecessary top-levels.
Begin prep for making an assembled version.
Body and stand attached.
Add struts to assembled model.
Clean up the mirrored logic for struts.
Add copyright notices to all files.
Handle another mirroring.
Folded versions of the baffles.
Engines mounted on assembled view.
Remove coloring.
Build all model parts and add stls for github.

Since github has the ability to display STL files, there is a strong
incentive to add them even though they are generated files.
Update the readme file.
Combine engine and engine_mount files.