Consider separating dungeon prizes from regular items

[fdtaillefer]

Dungeon prizes seem quite different from items. Items are accessible nodes, while dungeon prizes are tied to a boos fight. What's more, it seems like dungeon prizes cannot be put in the regular item pool, and their address data is more complex.

It could be a good idea to separate the two concepts. If that is done, change the schema so that a node's nodeAddress can't be an array.