Add new items to RaidGuild game

[ECWireless]

• Make sure that every single RaidGuild class has at least 1 claimable item
• Add at least 1 XP-restricted item
• Add at least 2 “purely cosmetic” items

[ECWireless]

Migration Requirements

• We need to first create a new game with matching items and classes from the old game
• We also need to duplicate all the characters (how they look, their items, their classes, their XP, etc.) to the new game
• Finally we need to add a warning in the new RaidGuild game that prompts each player to equip the same items that they had equipped in the old game
  • This will take writing custom code on the frontend that allows the new game to map its items to items in the old game, to make the "equipping items from old game" flow super easy

[ECWireless]

• Completed in new game: https://play.raidguild.org/games/gnosis/0x124a99898c87dcb7cb9cf5f55617d5cc351e1cb7