Future upgrades

[RohanNero]

Future possible upgrades:

• Allow timestamps to be used as opposed to block numbers
• Allow Reward Events to include nfts with only x metadata (or white/blacklist some tokenIds)
• Create script for converting timestamps into block numbers and vice versa
• Create script for calculating many heldUntil times
• Create script that allows users to claim in an easier way
• Create support for multi-claims so user can claim for multiple nfts at once
• Revise site to look better on mobile
• Support reward events for nfts that live on a different chain from the claim contract.
• Ensure there isn't any unwanted behavior/bugs. (Possibly looping from start + 1 block for transfer events could miss events that occured at the start of the event)