Allow Guild Rank Up And Quest Completion Loot Tables To Be Driven By Rarity Tier

[WarrenGore]

Currently loot tables have functionality for handling rift tier, but no scaling/rarity tiers outside of the rift. Allow a rarity tier to be set and influence the loot drop.

Implementation may look like the below, adding a "tier" line in the quest and guild loot data:

"rewards": [
    {
      "type": "wotr:loot_table",
      "loot_table" : "wotr:guild/cats_cradle",
      "tier": 3
    },

This should mimic the rift tier in how it is used in loot tables. This is different than using say the player's current guild rank, as a quest may always give a "tier 3" reward.