Add anti-abuse banning mechanisms #338
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Backstory:
Few days ago I setup a public 3rd party Minecraft server for me and my friends, but some port scanning griefer found it and wrecked havoc. After setting a whitelist and installing LoginSecurity, he can no longer get in, but I can see from the logs that he's trying his hardest - constantly trying commonly used names, changing IPs and so on.
While I'm fairly happy with LoginSecurity, it doesn't seem to have any anti-abuse mechanisms, so I'm a bit worried that the guy might finally bruteforce his way in. Therefore, I decided to bite the bullet and try to implement some mechanisms myself.
This PR adds basic banning functionality in 2 flavors:
Both are off by default and are toggable in the config in the new ban section.
As an addition, there's another switch there too (notify-ops) which when enabled, sends a message to each server OP if a ban was to occur.
Side note, I know nothing about Java so this was written as my best approximation of "how this change really should look like", comments welcome!
Corresponding Translations PR: lenis0012/Translations#209