Added
* Pi 5 support added. Includes platform detection, new raw formats etc.
* Libav encoders added. These will be used as the H264 and MJPEG encoder on Pi 5.
Changed
* Frame buffers are now cached to improve performance.
* Encoders should no longer drop frames when closed.
* FfmpegOutput should stop properly when there's an audio stream.
* Updates for the latest version of libcamera, including sensor configuration.