Weapon families: melee, archery and staves

Phase 2 of #147. The 17 families of docs/builds-catalog.md with their Q/W pools and each item's E; new weapon items; staves carry the spells (UO spells become Fireball, Heal, Lightning, Wall of Stone on their staves); reagents on W/E; unlocks by school level (§ 6.2); mob loadouts per species.

Done when each family is playable offline and online; the mobs of #124 use family abilities.