WIP: qstopmotion: new package (TODO: wrap ffmpeg)

qStopmotion enables you to create stop-motion animation movies.

qStopmotion is a fork of Linux Stopmotion. The main differences between
Linux Stopmotion and qStopMotion are: Run on Linux and Windows operating
systems. And probably also on MacOS, Redesigned user interface,
Minimized using of external tools and replace with Qt functionality, No
command line input from the user in the preferences