[univ] access children of star or galaxy
[desk] externalize findStar, handle continent for selection
[artist] fix continent pie drawing, adjusted cont text content and pos
[gui] view fitting actions: current or specific star
[gui] fix of "play next" during exit action
[qt] fit actions take bounds of object instead of center
[qt] counts polygons in visible items
[qt] isolate QtAntechamber
[qt] volume slider allow vol change by click
[qt] effective selectable option for main window
[test] added test (muted) for qt contDisplay check
[test] added children test in univ test
[doc] updated changelog