Includes:
- Fix a few clang-tidy warnings
- Add support for <img src="data:image/png;base64,...>
- XML parsing: add more HTML5 named entities, optimize search
- Text: fix standalone BR not making an empty line
- Fix BR with "display: block" not making an empty line
- Fix hyphens from soft-hyphens not part of highlighted segments
- Use libunibreak for line breaking
- Adds TextLangMan for text typography by language
Tweak ReaderHyphenation to work with the new TextLangMan
(even if it will be replaced soon by ReaderTypography).
6336927cb7