SaVi satellite constellation visualizer savi-dev

Updating Starlink script comments in view of their
latest FCC filing.

Noting OneWeb bankrupt

If sunlight is on, changing number of color shades needs to honor the
sunlight labels and not insert numbers. We could probably clean this
up better than writing the numbers then replacing them...

Celstrak is the source used most, so noting that.

Weird that Planet Lab's own tle is also including
other random stuff.... RapidEye? Skysat?

Adding OneWeb to TLE list now they've launched more.
Really need to rewrite this code to pass urls directly;
it's painful as is.

Details tweaks - default text is now always visible, at the bottom,
Recreating the window is inelegant, but a simple way to prevent a
crash if launching then immediate Empty Space... -- and it does
draw attention to the information.

Noting geosynchronous in scripts for repeating groundtracks.
Could make this its own submenu - undecided about that.

Adding first attempts at Singh's efficient four-satellite systems
as described in Nature Communications.

Minor Draim tweaks.

If we launch SaVi and immediately Empty space, freeze. Fixing that, inelegantly.
Problem with the Details window content.