Implement a new element in AstXML for AMI actions documentation.

A new xml element was created to manage the AMI actions documentation,
using AstXML.
To register a manager action using XML documentation it is now possible
using ast_manager_register_xml().
The CLI command 'manager show command' can be used to show the parsed
documentation.

Example manager xml documentation:
<manager name="ami action name" language="en_US">
    <synopsis>
        AMI action synopsis.
    </synopsis>
    <syntax>
        <xi:include xpointer="xpointer(...)" /> <-- for ActionID
        <parameter name="header1" required="true">
	    <para>Description</para>
	</parameter>
	...
    </syntax>
    <description>
        <para>AMI action description</para>
    </description>
    <see-also>
    	...
    </see-also>
</manager>



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@196308 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/pbx.h

@@ -27,6 +27,7 @@
 #include "asterisk/chanvars.h"
 #include "asterisk/hashtab.h"
 #include "asterisk/stringfields.h"
+#include "asterisk/xmldoc.h"
 
 #if defined(__cplusplus) || defined(c_plusplus)
 extern "C" {
@@ -73,12 +74,6 @@ struct ast_sw;
 /*! \brief Typedef for devicestate and hint callbacks */
 typedef int (*ast_state_cb_type)(char *context, char* id, enum ast_extension_states state, void *data);
 
-/*! \brief From where the documentation come from */
-enum ast_doc_src {
-	AST_XML_DOC,            /*!< From XML documentation */
-	AST_STATIC_DOC          /*!< From application/function registration */
-};
-
 /*! \brief Data structure associated with a custom dialplan function */
 struct ast_custom_function {
 	const char *name;			/*!< Name */