Port of https://github.com/tgstation/tgstation/pull/51817
Adds a mech vs mech combat system for the toy mechs earned from arcades and found around the station. You can initiate combat with yourself by hitting a toy mech with another toy mech, or fight another player if you attack a player holding a mech with a mech.
Each mech has its own health stat and special ability that they'll use in combat against each other. How exciting!
Also slightly refactors toy locations and changes toy mechs from being JUST prizes to their own proper toy subtype!