Add TWL library. The next thing to try.
Merge branch 'master' into twl
Fix close button to work properly.
Have a first version of GUI working (meaning I got a word onto the screen).
Merge branch 'master' into twl
Initial interface with a working button.
MainMenu now knows about the SolarSystem.
Merge with master. Fix errors.
Everything should be making their own buttons now...but they aren't.
A bit of button housekeeping.
Buttons work now.
Simple selection logic. Still needs work.
Merge branch 'master' into twl
Merge.
Allow speeding up or slowing down simulation with + and -.
Cleaned up rendering. Let planets also be selectable.
Add initial menu for objects - can change their masses. Also added way to tell all orbiters of an object to update their orbit info.