make compiled in python extension initialization more flexable

make compiled in python extension initialization more flexable
Because of weird library ordering issues, my test case that tested
running python code was looking for compiled in python modules that
weren't available yet it wouldn't link properly.

I solved this by making it possible to provide a list of what
compiled-in python extensions should be initialized when you launch
the interpreter, so the mussagl program, which does have all the right
components linked in is what is specifying what modules should be
provided to the python interpreter.

Now I just need to fix the build system so you can compile mussa without
all this python crud if needed.

And maybe decide how to launch the gui from a stanard python interpreter.