Ability to change EntityPickup:CanReroll()

[dpower12]

EntityPickup:CanReroll() makes pickups being able to be rerolled by things like d20 being able to change it would make some modded pickups work better with it, like for example modded chests, as opened chests are not supposed to be rerollable

[BenevolusGoat]

commenting because I would also like this methinks