cppreference-doc-20220730-bp155.3.36

- Add cppreference-doc-premailer-3.9-compat.patch: Make
  pre-processing compatible with premailer >= 3.9.

- Add BuildRequires: python3-cssutils for all openSUSE versions,
  but specifically require version 2.0.0 and above for oS 1550 to
  avoid build failures.

- Update to version 20220730:
  * No upstream release notes.

- Update to version 20220201:
  * No upstream release notes.

- Update to version 20211127
  (Switched to PeterFeicht's repository, which has new releases)
- Removed preprocess_qch.py - now bundled in source

- Update to version 20190607:
  + List of changes unavailable from upstream.
- Drop Fix-qch-build.patch: incorporate upstream.
- Add a build script missed by upstream tarball
  (preprocess_qch.py).
- New build dependency: python3-premailer.

- Add Fix-qch-build.patch to fix the qch generation.

- Initial version