Alicevision should be usable in an installed form (without sources) and without environment variables

[dkogan]

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Currently I THINK this is impossible? In the Debian package I just pushed I added a patch to make it possible: https://salsa.debian.org/science-team/alicevision/-/blob/master/debian/patches/using-config.ocio-from-system.patch?ref_type=heads