Move the `make doublecheck` functionality into a build system agnostic
script.
`scripts/quality-check.sh` can now be used to check for spelling via
codespell, formatting clang-format and run the unit tests.
`make doublecheck` and `meson compile doublecheck` will call this
script.
Sometimes we have issues with different versions of clang-format locally
vs our CI. In this case SKIP_FORMAT env variable can be set.
