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_module_interfaces.h

@@ -366,6 +366,14 @@ struct switch_speech_handle {
 };
 
 
+/*! \brief Abstract interface to a chat module */
+struct switch_chat_interface {
+	/*! the name of the interface */
+	const char *interface_name;
+	/*! function to open the directory interface */
+	switch_status_t (*chat_send)(char *from, char *to, char *subject, char *body, char *hint);
+	const struct switch_chat_interface *next;
+};
 
 /*! \brief Abstract interface to a directory module */
 struct switch_directory_interface {