Reset lurker status when a lurker's level is played or the queue is cleared

[demize]

Had an issue with one of my viewers who consistently showed as offline despite clearly being online; we managed to figure out that it was because he !brb'd at some point and never did !back. If you're running the bot only during streams this is fine, but when you run the bot persistently it never gets a chance to reset the lurkers.

This PR resets the list of lurkers on clear, as well as when a level is manually selected, to prevent such cases.

[liquidnya]

I wonder if twitch.notLurkingAnymore(username); should be called for other commands as well.

For example !level, !next, !subrandom, etc.
Because the queue picks from offline people whenever there are no online people in the queue.

[demize]

I wonder if twitch.notLurkingAnymore(username); should be called for other commands as well.

For example !level, !next, !subrandom, etc. Because the queue picks from offline people whenever there are no online people in the queue.

Ah, good point. Was an easy enough thing to implement; it looks like for every level that's pulled up, it either uses next_level_message or weighted_level_message and that's a convenient place to do the unlurking. It's now added to this PR :)

[demize]

And one more update... also unlurks on !leave. Squashed and force pushed myself to reduce the number of commits that end up on the main branch (and limit how many emails I get about new commits when this ends up merged).