FS-9714: [mod_conference] fix crash due to race on closing file handles when playing a file to a conference via api command as a conference is shutting down

FS-9719: Separate gen_ts_delta between audio and video and enable support to auto engage this feature for pass-thru video

FS-9705 #resolve [Files using prebuffer do not play properly when seeking back to the beginning once the file is done playing]

FS-9678: Fix FreeSWITCH not shutting down when profiles fails to load and shutdown-on-fail is set to true

Conflicts:
	src/switch_ivr_bridge.c

The AS descriptor for SDP b= lines is already defined in kilobits/second.
Fixes an issue with extremely low bitrate videos when a SDP media clause has
its own b=AS: line specified.

FS-9634 #resolve [RTCP mux is always proposed on outbound channels even if rtcp_mux chan variable is 0]

 Log count of encoded FEC frames in debug mode

Improve spanish translations for verto communicator.

FS-9632 remove SWITCH_FILE_FLAG_VIDEO flag if we fail to receive video so we fall thru and record the audio only.  Previously it would just fail to function as expected.

More consistent with the naming in other events, eg
register and unregister.

Exposes Verto MediaStream objects via the onGranted() callback

aa

Some of the console.error messages generated in FSRTC aren't really
error-worthy, downgrading appropriately.

stream.onended is being removed in Chrome 54, update to
stream.oninactive