Removes a ban that was written to the server (either in memory or on disk).
bool RemoveBan(const char identity, int flags, const char command, any source)
String to unban (ip or authstring).
Flags (only IP and AUTHID are valid flags here).
Command string to identify the source. If this is left empty, then OnRemoveBan will not be called.
A source value that could be interpreted as a player index of any sort (not actually checked by Core).
True on success, false on failure.