Add a de-costume enchant function

Suggestions
1

Imported from legacy Flarum.
Original author: VanyrMaelstrom (Flarum #39)

A way to remove Costume Enchantment stones from costumes would be cool, that way we could change costumes over time without having to regather all the stones.

Could cost Fashion Points too.

2

Imported from legacy Flarum.
Original author: Muh (Flarum #1)

Hi there.
This already exists.
Each NPC should have an option to remove an enchant back into a stone which costs fashion points.