Add the ability to filter spells by tradition in a Choice Set

[pedrogrullada]

As part of tagging spells granted by an ancestry, sometimes we need to find spells of a certain tradition through a Choice Set filter. As shown below (fireball as an example), the tradition traits of a spell are not part of its roll options, presumably because they depend on what spellcasting entry they end up.

It would be quite useful if spells outside of an actor would have roll options for their tradition, such as item:trait:arcane and item:trait:primal for Fireball. Or any other solution to the broader issue of being able to filter spells by tradition in a Choice Set.