FS-11785 [mod_conference] Fix dead assignments.  Removed auto-record-canvas-id param which never did anything.

                          fix dead assignments in conference_cdr

               null attribute in esl_buffer_read
	       null attribute in esl_event_base_add_header
	       null attribute in esl_recv_event

FS-11785 [mod_commands] scan-build thinks NULL parameter is being passed to function.  Shouldn't actually happen.

FS-11785 [mod_av] fix a couple dead assignments and inconsistent assumption that mm pointer could be NULL

FS-11784 [mod_sofia] quiet the codec negotiation error log.  It's something that is not necessarily a FS issue.

FS-11713: [core] fix a calls b with video, b answers with audio and then turns on video (A will have to unpause video too)

FS-11728 [core] add switch_ivr_play_and_collect_input().  This function plays a prompt while looking for DTMF or speech and returns whatever was heard.

(enable with sofia profile param rfc-7989=true)

FS-11557 [mod_sofia, mod_conference, core] Add support for re-INVITE when setting Session-ID in conference after call has been answered.

FS-11557 [mod_conference] Missed a spot where APP_SESSION_ID needed to be set.

FS-11557: set session id for outbound (initial requests)

FS-11557: [mod_sofia] rename vars and functions "session id" -> "session uuid" to reflect the real meaning for rfc7989.

FS-11557: fix bug - colliding chan var names (session_id)

FS-11557: check nil session uuid

FS-11557 : replace CS_NEW with CS_INIT for when originating calls, generate new uuid.

FS-11557: handle inbound (UAS mode, one leg)

FS-11557: generic param handling and filter via new sip profile option "rfc-7989-filter", eg:
<param name="rfc-7989-filter" value="logme, sec-agree, privacy" />

FS-11557: renamed chan vars (reflect meaning only for RFC7989)

FS-11557: fallback to RFC7329 - "old" Session-ID

FS-11557: distinguish between request and replies when we read the header
(to provide compatibility with old RFC7329 - section 11 of RFC7989)
FS-11557: change more vars/consts names

FS-11557: move compat flag on the channel.

FS-11557: add Session-ID header in REFER

FS-11557: needs extra condition on received initial request

FS-11557: handle NOTIFY

FS-11557: support answer() in dialplan - it was sending back a 200 OK with Session-ID invalid, eg: A=NIL;B=X

FS-11557: add Session-ID for NOTIFY (more cases)

FS-11557: handle reply to SIP INFO (add Session-ID header)

FS-11557: handle case of BYE after REFER, when the channel is destroyed already (save the uuid on sofia_private)

FS-11557: handle more SIP reply cases (eg: 202 Accepted , more negative replies)

FS-11557: handle ACK (UAS role)

FS-11557: added "rfc-7989-force-old" profile param - to enforce old rfc7329 for the UAC role. default off.
enabled with "<param name="rfc-7989-force-old" value="true" />".

FS-11557: fallback to rfc7329 fixes.

FS-11557: set flag CF_RFC7329_COMPAT on partner channel where needed

FS-11557: fix crash (mod_conference)

FS-11468 Try to split payload to packets evenly(with largest at the end) up to vpx_globals.rtp_slice_size,
(assume hdrlen constant across all packets of the same picture).
It keeps packets being transmitted in order.
Without it last (and thus the smallest one) packet usually arrive out of order
(before the previous one)