8.4: added two new connection events:
        reg_user: fired when the USER command is used successfully;
        reg_nick: fired when the NICK command is used successfully.
        added validident() utility which uses the same character set as charybdis's match.c.
        ALL ident lookup logic is now in the Ident module, including the tilde insertion.
        if the user requests an ident prefixed with a tilde in the USER command, the ident check is skipped.