EPUB 3.3 support

[vers-one]

EPUB 3.3 support

This is:

• a bug fix
• an enhancement

Related issue: #83

Description

This pull request adds support for EPUB 3.3 into EpubReader.

In particular, it:

• adds parsing of the hreflang attribute of the package/metadata/link element;
• adds auto into the list of possible values for the dir attribute;
• adds support for the following MIME types:
  • image/webp;
  • font/ttf;
  • font/otf;
  • font/woff;
  • application/font-woff;
  • font/woff2
  • font/sfnt;
  • application/font-sfnt;
  • audio/mpeg;
  • audio/mp4;
  • audio/ogg;
  • audio/ogg; codecs=opus;
  • application/javascript;
  • application/ecmascript;
  • text/javascript.
• adds EpubBook.Content.Audio and EpubBookRef.Content.Audio collections for the audio content files;
• adds support for the following values of the properties attribute of the package/spine/itemref element:
  • rendition:layout-pre-paginated;
  • rendition:layout-reflowable;
  • rendition:orientation-auto;
  • rendition:orientation-landscape;
  • rendition:orientation-portrait;
  • rendition:spread-auto;
  • rendition:spread-both;
  • rendition:spread-landscape;
  • rendition:spread-none;
  • rendition:page-spread-center;
  • rendition:page-spread-left;
  • rendition:page-spread-right;
  • rendition:flow-paginated;
  • rendition:flow-scrolled-continuous;
  • rendition:flow-scrolled-doc;
  • rendition:flow-auto;
  • rendition:align-x-center.
• removes the following metadata values (they have been completely removed from the EPUB specification):
  • acquire from the rel attribute of the package/metadata/link element;
  • xmp from the properties attribute of the package/metadata/link element.

Testing steps

This pull request includes unit tests that exercise all new attributes and schema types.