Only jsf parts of #60

[nilsbore]

Cherry-picking the parts out of https://github.com/nilsbore/auvlib/pull/60 that are relevant for parsing jsf. The xtf parts that John have done will need a separate PR to figure out what is causing the windows build failure.

[nilsbore]

@xyp8023 So these are only the jsf parts but it's still failing on windows for some reason. I've rebuilt the current master on CI and it's still building so it's not a problem with CI having been updated.

[nilsbore]

Suspicion confirmed: https://github.com/nilsbore/auvlib/pull/63 builds.

[xyp8023]

Maybe we can do something like this?:

if (MSVC AND ${MSVC_VERSION} GREATER_EQUAL 1915) target_compile_definitions( ${target_name} PRIVATE _ENABLE_EXTENDED_ALIGNED_STORAGE ) endif()

[nilsbore]

If that fixes the problem, that would be a good way to do it. Please open another PR with that change to see if it builds. Make sure to base it on the only_jsf branch.