* Remove the "sync_mode" dropdown from timeline header, and move it into
the Playback menu instead.
* Remove the confusing "Frame Dropping" and "AV Sync" entries from the
Playback menu. These were supposed to be mutually exclusive (or else,
the "sync_mode" menu would break).
* Turn AV Sync on by default
* Commented out the Frame Dropping and Av Sync RNA Properties too.
THere doesn't seem to be any valid reason for these to exist?
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