Run dos2unix on the tree. No user-facing changes.
Downcase settings directory. Only affects Linux
Remove unused member variable
Fix splines not loading from ini without restart

It's still a mess, though.
Move spline configuration into separate file

Unfortunately, there's still a circular dependency between spline
configuration and the main widget which *still* contains the most logic
for the software.
refactor QFunctionConfigurator

While the API is more clear now and withstands config changes properly,
there's a performance degradation while moving a spline point. It now
refreshes whole spline.
throttle QFunctionConfigurator updates

Don't consume whole CPU time when the spline editor control points are
being dragged.
QFC: Don't throttle as much, it's jerky