deps: add imageio-ffmpeg requirement to install.py #42
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Fixes #41 by adding imageio-ffmpeg to extension requirements/dependencies.
This is required due to some changes with moviepy's underlying imageio library, which has deprecated/removed the old autoinstallation method around 2019-ish, and as such moviepy is no longer capable of autoinstalling ffmpeg.
See Zulko/moviepy#906 and Zulko/moviepy#908 for further details on the moviepy side.
This does result in downloading ffmpeg on systems where it may already be installed, but it's a reasonably small download and on some systems (eg Ubuntu 22.04) moviepy 1.0.3 fails to pick up system ffmpeg anyway.