FS-7513: refactor mcu code, put everyone on a canvas and send out using a dedicated thread with a constant FPS

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FS-7166 #resolve

# This is the 2nd commit message:

revert

FS-7499: keep track of from addr from rtp separate since on ice you get stun packets etc from other ip.  This helps auto adjust work properly

FS-7513: restore video relationships and refactor conference to use video_read callbacks instead of its own thread and change behavior so video floor holder never sees their own video unless they are the only one with video in the conference