Allows xenobiology to create mimics, slight change to mimic meat

Created by: unid15

• Mimic meat now transforms when injected with 5u blood, instead of when it's hit by a rolling pin
• Injecting a golden slime core with 5u water summons a mimic after 5 seconds. The mimic's shape and size is affected by its location and surroundings (at the time of the summon)
• If the golden slime core injected with water is stored in a crate, a crate mimic spawns to replace the crate. All items inside are moved inside the crate mimic, and the old crate is deleted.
• If the golden slime core injected with water is held by (or otherwise stored in) a mob, a mimic that looks exactly like the mob is summoned. The mob mimics behave just like crate mimics, and will spawn a naked corpse when dead. Note that examining it doesn't show any of its items, just the human mob's description, which is a way to identify mob mimics.
• Otherwise, it summons a random item/crate mimic

I'll update the wiki if this gets merged