Renamed module to nodeboxgl and renamed c-extensions

[karstenw]

Hello,

I renamed module to nodeboxgl and renamed c-extensions (nglbezier.so, nglgeometry.so and nglnoise.so) and made them both installable.

All imports have been adapted and the sys.path insertion in the examples has been removed.

The main motivation is to have them installed along the Nodebox 1 console.