add watchlist feature

[woolwind]

I cloned the mute module, so syntax is identical - local watch may not really be useful, I'd use global all the time, but simplest to just keep it the same.

gwatch player reason gunwatch player reason

Watchlist is for letting staff keep an eye on players who have been behaving suspiciously but not done anything bannable yet.

When a player who is watched joins bungee or switches servers an announcement is sent to everyone with bat.watch.broadcast permission in bungeecord (normally staff, but could be whatever group you want). There is also an announcement when watched players disconnect.

watchlist isn't tested in reddis since I dont have it.