OMS - remove equipment

[mwerle]

Requested by @michel Bartolone in this forum thread, the idea is to be able to remove equipment which has been installed in one of the labs in order to make room for other equipment (*).

Equipment would be removed and stored in an Lab Equipment Transport Container which could then be returned to Kerbin (or just dumped and left to burn up).

(*) Currently this is of dubious value since lab equipment is always installed into an assigned slot in a lab. But another long-term improvement idea is to be able to install equipment into any compatible slot.