Drop nbproject from git

Always a hassle
stm32: Don't build usless bins
Separate funcgen platform code out

This should make it possible to test large chunks of the waveform generation
and interpolation and scpi parsing code on the host machine, without needing
hardware.
Working x64 tcp server for core funcgen code.

And a pile of bugfixes along the way.  Now we can debug all the waveform
calculation code in desktop linux, instead oftesting on real hardware.