Separate xetex-inputenc test sample in working and non-working parts.
Sort HTML-only tests.
Update tagging and ignore-rules.
Change inputencoding to utf8 in dedicated tests (get pdf4_texF working).
Prevents wrong or missing characters with LuaTeX and 8-bit fonts.
Also "uninvert" the corresponding test case and two other
no longer failing "unicodesymbols" exports.