Predicates

[BlayTheNinth]

Similar to Crafting for Blockheads, it would be nice to specify soft and hard predicates for trades that are evaluated on a per-player basis

[BlayTheNinth]

Added a predicate field backed by Shogi (26.1+) that will control whether the item shows up or not on a per-player basis. No "soft predicates" for now, can do those when someone asks for them specifically.