Treasure maps

Implementation of /forage with worms and thugs spawning occasionally.
Yields enzymes, baits and mysterious data disks.
(GM option only yields disks for testing convenience)
Using the disks starts a treasure map (on the same planet for testing convenience)
Some buried treasure loot has been added.
Adversaries spawning when chest spawns.
The treasure map feature is not completely done, so certain things do not work yet as intended.