Provide more flexibility in specifying damage formulas

Things like ground dots and direct sources of damage vary in the order of operations they apply buffs/debuffs, 5% variance, etc. From Rime on AS: i believe for ground dots it is base dmg -> buffs -> +/-5% variance -> crit -> dhit -> debuffs for direct damage (variance -> crit -> dhit) -> source statuses -> target statuses specifically any buffs/debuffs which snapshot happen before randomization