* Remove the code behind for AVCaptureConnection.SupportsVideoMinFrameDuration
and AVCaptureConnection.SupportsVideoMaxFrameDuration. The codebehind looks like
a workaround for Apple renaming the selector, but from history it looks like that
happened before the earliest version of iOS we support today, so this can be expressed
in an api definition now without any code behind.
* Add these fields to macOS, where they're not even deprecated (like they are on
other platforms).
* Remove conditional code in api definition, and distribute [No*] attributes as
required.
* Remove the AVCaptureConnection.AudioChannels property from .NET, it doesn't do
anything useful.
Rolf Bjarne Kvinge