* feature/mod_conference_mandatory_member_flag: Add flag to destroy the conference only when all mandatory members disconnect. And set endconf to end the conference when any member with the flag disconnects
In mod_conference 1.6.x, all conference users could get the audio floor
regardless of the kind of video layer they were placed in.
In 1.8.x, the concept of a 'dedicated video layer' was introduced, such that
video layout slots with a reservation ID or a role ID are marked with the
'MFLAG_DED_VID_LAYER' member flag when a member is in the slot, and such
marked layers are prevented from becoming the conference audio/video floor
holder.
This makes sense for the video floor in all circumstances, and the audio floor
in most circumstances.
However, there are some circumstances where allowing users in these dedicated
video layers to become the conference audio floor holder is preferred, such as
when all slots in the layout have reservation IDs, and the audio floor events
are used to manage users in those slots manually.
This adds a conference profile flag, 'ded-vid-layer-audio-floor, which, when
enabled, allows conference members in dedicated video layers to become the
conference audio floor holder.
Commit c49f87313ad3d6c65d0a68c80763822772c42cbd, which added a vmute
option to the conference member flags, was somehow lost in the
mod_conference refactor. This commit restores the lost code.
FS-7813 #resolve
function name prefixes from shorthand 'conf' to longer form
'conference'. Also fixes the channel variable names which had been
caught in an over zealous perl -pi -e command...
