Add ENCRYPTED_PUBLIC and ENCRYPTED_PUBLIC_NOTICE formats

Encrypted messages to a channel need to use their own format.  This also fixes the use of ENCRYPTED_PRIVMSG
and ENCRYPTED_NOTICE - they were being called with too many arguments so the destination nick was being prepended
to the message text.

include/cset.h

@@ -195,6 +195,8 @@ FORMAT_EBANS_FOOTER_FSET,
 FORMAT_EBANS_HEADER_FSET,
 FORMAT_ENCRYPTED_NOTICE_FSET,
 FORMAT_ENCRYPTED_PRIVMSG_FSET,
+FORMAT_ENCRYPTED_PUBLIC_FSET,
+FORMAT_ENCRYPTED_PUBLIC_NOTICE_FSET,
 FORMAT_FLOOD_FSET,
 FORMAT_FRIEND_JOIN_FSET,
 FORMAT_HELP_FSET,