Various cleanup

- Rename files
- Also add language tags without the Xsux suffix
- Change the #+system metadata to include a reference to "Borger"
- Clean up table header
- Add table and test to Makefiles and make sure the test is only run
  when ucs4 is enabled
- Update extra/generate-display-names/display-names
- Update .github/workflows/fuzzing.yml
- Add #+unicode-range metadata because the table only works when ucs4
  is enabled
7 files changed