GitLab

* Added companion classes (radio buttons)
* Added pulsar mass (slider)
* Added pulsar semi major axis (slider)
* Removed orbital frequency/radius sliders (calculated from mass ratio and/or semi major axis)
* Showing separate orbital plane visuals for pulsar and companion
* Using fixed size for orbital plane visuals (gives a feeling for radii/distances)

Also:
* Extended frustum's z-far plane
* Using dedicated quadric for companion (why did it work without?)

Note:
* Semi major axis is adjusted when mass ratio is changed (via then fixed orbital period)
* Semi major axis is capped at 1 AU and 20 AU