Update to Dune 3.0, fix build of benchmarks, various fixes #222
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Dear maintainer,
This PR updates the build system to depend on Dune 3.0 as it gives many niceties and new warnings. Accordingly, it also fixes the new warnings.
I've also seen that the benchmark wouldn't build so I've updated them for core_unix v0.15.0, and declared their dependencies for testing in the opam files.
Last but not least, angstrom-unix, angstrom-lwt-unix and angstrom-async now depend on the same version of angstrom as they are. Although this could be lifted, I think it greatly simplifies integration and debugging.
Thanks!