crowbook 0.5.1

on Rust Cargo

Mostly rendering fixes:

• Epub:
  • Fix a validation problem when book contained hidden chapters.
• French cleaner:
  • Use semi-cadratine space instead of cadratine
    space for dialogs.
  • Use non-narrow non-breaking spapce instead of
    narrow one for ':', '«' and '»' (following
    https://fr.wikipedia.org/wiki/Espace_ins%C3%A9cable#En_France).
• HTML:
  • Add viewport meta tags.
  • Standalone HTML:
    • Don't display the button to display chapter and
      the previous/next chapter link if html.display_chapter is set to
      false.
    • Fix chapter displaying when some chapters are not
      numbered.
  • Multi-files HTML:
    • Fix previous/next chapter display to make it consistent with
      standalone HTML.