refactor earlier junk from this eve and add ken's propagate variable thing

set this sometime before an origination (bridge etc).

<action application="set" data="propagate_vars=my_cool_var1,my_cool_var2,foo,bar"/>

and they should be cloned over to the new channel when it's substantiated



git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@3101 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/include/switch_loadable_module.h

@@ -73,6 +73,8 @@ struct switch_loadable_module_interface {
 	const switch_speech_interface_t *speech_interface;
 	/*! the table of directory interfaces the module has implmented */
 	const switch_directory_interface_t *directory_interface;
+	/*! the table of chat interfaces the module has implmented */
+	const switch_chat_interface_t *chat_interface;
 };
 
 /*!
@@ -163,6 +165,13 @@ SWITCH_DECLARE(switch_speech_interface_t *) switch_loadable_module_get_speech_in
  */
 SWITCH_DECLARE(switch_directory_interface_t *) switch_loadable_module_get_directory_interface(char *name);
 
+/*!
+  \brief Retrieve the chat interface by it's registered name
+  \param name the name of the chat interface
+  \return the desired chat interface
+ */
+SWITCH_DECLARE(switch_chat_interface_t *) switch_loadable_module_get_chat_interface(char *name);
+
 
 /*!
   \brief Retrieve the list of loaded codecs into an array