Fix multiple group members trying to loot the same corpse

[DatBear]

This adds a Looting topic, broadcasts corpse ids to it, and makes sure no other group members are already looting the corpse before beginning to loot.

[RekkasGit]

will hopefully get some time this weekend, but I do have to build a new pc for someone so will see (it could go quick n easy or a real pain.. its like a roll of the dice)