This commit takes the frame tracking code and internalizes it into the
VideoFrame class itself for better reusability. The code in
CameraSource has since been removed.
And properly handle toxav happily delivering things out of order,
like firing a video frame callback right after a callback setting the bitrate to 0,
when the peer sent these commands in the right order
The qTox Project is not associated with the Tox Project in any way, with the
exception of "qTox" using the Tox Projet's "toxcore" collection of libraries.
In particular, the Tox Projet does not own copyright over the qTox Project's
"qTox" collection of software, source code, and assets.
The qTox Project's assets are under the sole copyright of the qTox
contributors, and no partiular rights are granted to the Tox Project.
