Add multi-channel Stasis messages; refactor Dial AMI events to Stasis

This patch does the following:
 * A new Stasis payload has been defined for multi-channel messages. This
   payload can store multiple ast_channel_snapshot objects along with a single
   JSON blob. The payload object itself is opaque; the snapshots are stored
   in a container keyed by roles. APIs have been provided to query for and
   retrieve the snapshots from the payload object.
 * The Dial AMI events have been refactored onto Stasis. This includes dial
   messages in app_dial, as well as the core dialing framework. The AMI events
   have been modified to send out a DialBegin/DialEnd events, as opposed to
   the subevent type that was previously used.
 * Stasis messages, types, and other objects related to channels have been
   placed in their own file, stasis_channels. Unit tests for some of these
   objects/messages have also been written.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@384910 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/channel_internal_api.c

@@ -42,6 +42,7 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
 #include "asterisk/stringfields.h"
 #include "asterisk/data.h"
 #include "asterisk/indications.h"
+#include "asterisk/stasis_channels.h"
 #include "asterisk/channel_internal.h"
 #include "asterisk/test.h"
 
@@ -1400,4 +1401,7 @@ void ast_channel_internal_setup_topics(struct ast_channel *chan)
 
 	chan->topic = stasis_topic_create(topic_name);
 	chan->forwarder = stasis_forward_all(chan->topic, ast_channel_topic_all());
+
+	ast_assert(chan->topic != NULL);
+	ast_assert(chan->forwarder != NULL);
 }