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

* Polished labels/units
* Added more status tips
* Added view option: Rotation Axes (instead of activation just during mouse interaction)
* Added Run/Pause/Stop button states
* Added preliminary About dialog

* Also: added missing parameter initializers (based on GUI settings, removed independent ones)
* Also: factored out parameter reset method

* Better efficiency (of course one timer is sufficient!)
* Less complexity, higher accuracy (just compute the actual rotations!)

* Added toggle for status bar (view menu)
* Added toggle for menu bar (now invisible, have to preserve shortcuts somehow!)
* Added primary control button to animation control
* Improved animation control action

* First rough GUI layout
* Added widget for OpenGL context
* Using dedicated working directories
* Adjusted .gitignore