Update SVT-AV1 target quality params for v0.9.0

[redzic]

Should fix #556, although now target quality won't work for SVT-AV1 <0.9.0 as we use preset 12. Not sure if we should use preset 8 instead by default as it did before, as SVT-AV1 0.9.0 was released quite recently so people may not have had enough time to update to it yet

[shssoichiro]

Maybe we run a version check by parsing SvtAv1Enc --help to determine which to use? Arch doesn't even have 0.9.0 yet, so this probably breaks about 98% of people.

[silverbacknet]

--version but yes, absolutely critical given the huge reorganization between 0.8.8 and 0.9.0. If you ever feel like switching to the API, it's very easy to get there too, via svt_av1_get_version().

[redzic]

@shssoichiro I've updated this PR to include a version check for SVT

[shssoichiro]

Do we also need to update the parameter validation?

[redzic]

The parameter validation is dynamic, i.e. it parses the correct parameters at runtime based on --help output, so it shouldn't need updating.

[shssoichiro]

Looks good assuming CI passes