Make it possible to customize individual fieldset fields

[aerni]

I often find myself wanting to edit a few fields in a fairly complex fieldset. Mainly changing things like a field's title or instructions.

I believe the best option would be to make linked fieldsets configurable the same way you can configure individually linked fields. This would allow users to link complex fieldsets and change the config of individual fields if needed.

A simpler approach might be to add a new button that "explodes" a linked fieldset into the blueprint. This button would convert the linked fieldset to actual blueprint fields.