feat: Add unified quality-check script and git hook support

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.

Makefile.am

@@ -374,4 +374,5 @@ format-sources: $(core_sources) $(main_source)
 spell:
 	codespell
 
-doublecheck: format check spell
+doublecheck:
+	@./scripts/quality-check.sh --fix-formatting --autotools