Add user ban option

[aaronfisher-code]

In light of the recent "Grincher" events with this player forcibly joining servers, a direct ban method would be nice to have using either the in-game system, or some custom solution if possible (as currently it seems he can join servers even when banned)

[5GUY]

Need this ASAP... Just came here looking for the same thing. Having a dedicated server is now useless because he just joins after a few minutes of running it. We need a way to block steam IDs from connecting or something.

[DrMeepso]

Added player bans #10 v1.1.1 has everything added

[jonjimjoebobbillybobob]

Still having him join even when banned alongside a few others who seem to have discovered a way to obfuscate their connection somehow to circumvent bans. Would there be a way to close these connections and sanitize their presence from the server?