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- add missing locking
- bundle and settings ptr are never null following initialization;
sentinel objects get created if there's no bundle, thus don't branch
outside initialization functions. the sentinel object doesn't load or
save to the .ini file
- connect spline refresh to any bundle change
- connect spline widget refresh to spline refresh
- few caveat comments
- spline_widget::setConfig now only takes the spline as argument,
eliminating most of the complex logic there
- clarify spline::set_bundle vs newly introduced spline::recompute
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