change most char * values in ivr_menu functions to const char *
change switch_core_strdup to get passed const char * instead of char *
change switch_xml_find_child to get passed const char * instead of char *
change the ivr dialplan application to free the xml config as soon as it is done building the xml menu and not hold it until the menu is done being run, so that you can do a reloadxml while someone is in a menu without blocking.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4260 d0543943-73ff-0310-b7d9-9358b9ac24b2