It is now possible to sync the GimpDrawableFilterConfig with core.
Another (simpler on usage) possibility could have been to sync
automatically when a property is updated. But considering that some
filters can be quite slow to render (especially in real-life usage when
working on possibly very big files), and especially that on bindings
with no variable args, scripts will likely have to edit properties one
by one, it could make editing multiple properties very slow. Therefore
the chosen solution is that editing properties stay local on libgimp and
all changed properties are synced with core at once (with a frozen
render until the end for single computation) when calling
gimp_drawable_filter_update().
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