Add TLS_REC.

This patch adds the TLS_REC structure. This structure is used to emit
information about the TLS handshake from the core of irssi to the
front-end layers such that we can display connection information to the
user.

src/perl/get-signals.pl

@@ -37,6 +37,7 @@ while (<STDIN>) {
 		RAWLOG_REC    => 'Irssi::Rawlog',
 		IGNORE_REC    => 'Irssi::Ignore',
 		MODULE_REC    => 'Irssi::Module',
+		TLS_REC       => 'iobject',
 
 		# irc
 		BAN_REC		    => 'Irssi::Irc::Ban',