Draft: Wip/jehan/signals gimp

Jehan requested to merge wip/Jehan/signals-GIMP into master

Pushing the signal commits on a separate branch, as they have now been separated by the now-merged !112 (merged).

@mitch wanted to deal with libgimp objects life cycle in a different way, and it may mean that signals may be reimplemented in a different way too. Still putting these commits out there, in order not to leave these out-of-sight. 👀

Edited by Jehan

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