Add OTR support.

This patch adds support for the OTR protocol to irssi. This is an import
of the external irssi-otr project that we are now taking over
maintership for.

Major thanks to the original authors of Irssi-OTR: Uli Meis and David
Goulet. Thanks to the OTR community in #OTR on OFTC, thanks to everyone
who have helped testing the patches and submitted UI suggestions.

src/otr/module.h

@@ -0,0 +1,29 @@
+/*
+ * Off-the-Record Messaging (OTR) module for the irssi IRC client
+ *
+ * Copyright (C) 2012 - David Goulet <dgoulet@ev0ke.net>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301,USA
+ */
+
+#ifndef IRSSI_OTR_MODULE
+#define IRSSI_OTR_MODULE
+
+#include "common.h"
+#include "servers.h"
+
+void sig_message_private(SERVER_REC *server, const char *msg, const char *nick, const char *address);
+
+#endif /* IRSSI_OTR_MODULE */