Removed support for HINFO and MINFO resource records.

These RR's are very difficult to validate and, in their current state,
are vulnerable to RCE attacks. Furthermore, BeEF does not have a use for
these RR's.
Removed support for TXT resource record.

Like the HINFO and MINFO RR's, TXT is vulnerable to RCE attacks and has
no purpose at the moment. TXT may be needed in the future (e.g. data
exfiltration) which is why it has been removed separately.