Reaction-based roles should check all users who have/haven't reacted on startup

[Hona]

If users add/remove a reaction while the bot is down,, it won't give/take the role. On startup, it should check all users, and update roles to be correct.

This is probably a long running action with ~3600 users to check.

[Gocnak]

Shouldn't check against all users, only the users that reacted vs the users with the role.

[Hona]

What happens when a user removes a reaction while the bot is down?

[Gocnak]

They keep the role (bot wasn't online to remove it right?), and the bot compares who reacted to who has the role, finds the set difference, and removes the role from those who don't have the reaction.

[Hona]

Yep, this will work.