mod_rayo: fixed prompt state machine - wrong state transition when output finishes before input starts

While sofia does garbage collection, in other locations we still call su_free after calls to sip_header_as_string. So adding it here too since we've finished using the full_contact variable.

add via_protocol to request so you can be informed if you wish to force expires due to tcp keepalives being on.

FS-4819 --resolve we can match the one offered just for the sake of interop since it probably won't hurt anything, if it does we can take further action

Conflicts:
	libs/sofia-sip/.update

FS-5778 --resolve use switch_core_event_hook_remove_receive_message() to bind to receive_message and case for new SWITCH_MESSAGE_ANSWER_EVENT, SWITCH_MESSAGE_PROGRESS_EVENT, SWITCH_MESSAGE_RING_EVENT

Conflicts:
	src/include/switch_types.h

Conflicts:
	src/mod/endpoints/mod_sofia/sofia.c