concept(mafia): Modular item system

[Golbolco]

Items already have many variants, but what if in tandem with #1512 items were modular and upgradeable depending on game actions and events?

Example: Gun

• Default gun: always reveals, kills unless hitting someone with an extra life or a vest
• Possible upgrades: silencer (never reveals), rifled barrel (turns it into a rifle), salt rounds (causes target to bleed, replacing the Knife item), silver bullet (only kills evil players, replacing the Stake item)
• These attachments are at the discretion of the player who gives the item. Other events might enable players to make or find upgrades for their items

Related: Fabricator is meant to be the overall counter to item-giving roles on the Village side.

• Every item must have a broken variant (change internal nomenclature from "cursed" to "broken")
• Gunrunner is superfluous. Allow Fabricator to give out asso guns, and for Saboteur to turn regular guns into asso guns