AntiBot: find better implementation for users in time span

[ljacqu]

The AntiBot class checks that in the last 5 seconds not more than x players have joined. This is being solved with threads, so a task with a wait time is scheduled to decrease the counter again. Find a better way of doing this without scheduling threads.

[Platinteufel]

With the current implementation AntiBot can also enable after a server restart, when all players try to rejoin again. Maybe there should be an option that AntiBot only triggers on X unregistered players? I think you don't have to check regular players.
If I get a botattack the probabilty that there are known players is very low, especially if they have names like "gd52heg2hd6u".

[ljacqu]

@Platinteufel this is the intended behavior of AntiBot (only fire if X unregistered players are observed). Please open another issue if this is not the case