[Items] Harvest any spellgems in the crabs' caves

[Riss]

I propose to allow harvesting any spellgems (orange and purple too) in the crabs' caves under Centrum. Not because I've been looking for a Sharp Vision for two weeks, but because crabs are people too and they are BORED!

[Repth]

I'm fine with this if other Devs agree and want to do the dirty work. I initially added them to the search table because it's far simpler to do than to add a harvest option and because it's less 'controversial'.

[Kandarin]

I was going to do this, but when I opened devtools it looks like someone already did. Thanks, mystery dev!

This thread gets a tow to Implemented.