Notification for change of day

[Zer0-One]

When midnight hits, toxic should display a message in the chat history that indicates the change of day, like most IRC clients do.

Something like this:

Day changed to 12 Jan 2023

Currently, times just roll over and it's hard to tell what day a given message was sent on.

[Tha14]

I'm going to work on adding this one, just didn't have time to do so till now :)