All tests passed d4d196619d5708834dd880fd62637b657e9a30ad

Fixes #293
- Some users wished that Outcome would be clean with `-Wpedantic`, this is now turned on for
the test suite.

Fixes #294
- All use of `assert()` has been replaced with `OUTCOME_ASSERT`, which can be user overridden
at compile time.

Fixes #295
- In git commit 12b14e1533848e9a0f7f3c38e41da0ee4e819770 (Aug 11 2022) status code had its
paths changed due to its headers not previously having the right path convention. It was not
realised at the time that in Boost.Outcome this resulted in
`<boost/outcome/experimental/status-code/status-code/headers.hpp>` which is not desirable.
This has now been remedied to remove the double `status-code`, which will obviously break
any Boost.Outcome code which relies on the double `status-code`. Standalone Outcome is unaffected.

Use the 'all-sources' tarball below, NOT the github generated one which is missing dependencies: