Add satellite observation planning

As mentioned in my previous MR, I think it would be useful to have satellite observation planning capability. I can work on it myself, but I would like to open discussion before in order to ask if you think this feature fits within KStar's goals :) and to request advice in one particular issue:

The current planner works with J2000 and DEC for the coordinates (see attached screenshot) which evidently does not work for most satellites. It is possible to find satellites with the search function, but RA and DEC are set to 0 (default behavior I assume, see also screenshot). I have some ideas regarding the implementation, but nothing I really like, maybe you can give me some feedback. The ideas I had were the following:

1. Upon detecting that the selected object is a satellite (via name or context menu in the wishlist) automatically replace RA and DEC with TLE input
2. Add clickable radio button somewhere (under Target? under Steps? Job Constraints?) upon click RA and DEC will be replaced with TLE and ideally automatically filled
3. Leave everything as it is, with a Job Constraint "Satellite". If the constraint is marked, KStars will try to find the corresponding TLE

My preferred solution currently would be a combination of 1 and 2, although 3 would be fairly easy (I think) so maybe I would start there since it is an unobtrusive change. I filed a request issue on bugs.kde. Looking forward to your thoughts!