Better rewards (#157)

* Added rerolls

Added reroll functionality to rewardSelectionUI
Added applicable player stat
Added player stat for additional rewards

* Implement Relic rewards by rarity

Rework GetRandomRelics to get relics based on rarities and odds by rarity
Added RelicRarityPools
Added RarityOdds stat to player
New behavior explained in in-code documentation

* Added rarity outlines for relics

Author: LifeHckr