Update jlqml to new libcxxwrap / libjulia

[fingolfin]

Make some progress towards issue #2160

Should not be merged before @barche had a chance to review and comment. Also, there are some questions to discuss:

1. Which version to use for this JLL? It really shouldn't be the same as right now, as the list of dependencies changes, and that requires a new version.
2. Which Julia versions should this JLL be made compatible with? Right now, this is built for Julia 1.5.3 or later, and thus only usable in Julia >=1.5. But we could make versions supporting 1.4 or even 1.3 if desired. But that's extra work and complexity, so I first would like to get this version working, and also hear explicitly that Julia 1.3/1.4 support is wanted, before spending time on it.
3. The two first points are actually somewhat related: in order to support multiple Julia versions, the trick we used in other JLLs is to use the patch level of the version string to indicate the Julia version; that would suggest to reversion this package to something like 0.3.X where X is equal to the one in the Julia version 1.X. However, then packages using this JLL may need to be updated.

[fingolfin]

I took the liberty of sorting these arguments alphabetically and generally aligning them with other JLLs, in the hope that this will help a bit with future maintenance.

[barche]

Thanks for this, I just did a new release and updated this PR accordingly, looks perfect to me!

[fingolfin]

@giordano this can be merged now