Finishing off some unfinished business (from the multi-target constraints work), it is now possible to get/set target-space for constraints where this is relevant.
For this to be possible, target-space setting(s) are now always presented as a list of ints, with each int representing the target-space setting for the relevant target.
Constraints C-API note:
get_targets function now needs to return the number of targets the constraint can have
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