Implement timestamp minute counting

[lbirkert]

Fix #151

This has several benefits:

• Allows for a more accurate counting of minutes
• Removes the need for update queries for every session every minute
• Allows the bot to count minutes even when down

[AdamEXu]

hurry up and approve this code

[AdamEXu]

@hackclub

[techpixel]

hey, I can't approve & merge this without thorough testing. I'll send you the necessary creds. I'm testing it locally on my own machine using - I'll let you know if it works or not.

[AdamEXu]

i already said i approved, why did you request a review?

[rutmanz]

I haven't tested but the code lgtm

[lbirkert]

(had to undo the change, as it would be a bug not to, and pixel already said this would be attacked in a future PR)

[techpixel]

Tested and the code lgtm. Will merge when I get home. (Merging will require bot downtime)