Edit book: Fix Check Book failing if a binary file such as an image or font is mislabelled in the OPF as being a text file. Fixes #1320977 [Private bug](https://bugs.launchpad.net/calibre/+bug/1320977)
Docs for the set semantics tool
Live CSS renders
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Implement collapsing of live css groups
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Implement hover indications
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Display a swatch for color properties
Show line number of tag in live css panel
Wire up the hyperlinks
Friendlier error message when user inputs invalid regex. Fixes #1321311 [Edit Book: Strange error because of wront syntax in Regex](https://bugs.launchpad.net/calibre/+bug/1321311)
DOCX Input: Workaround buggy version of Microsoft Word converting newlines in the document summary into _x000d_. They are now ignored when reading metadata from docx files. Fixes #1321343 [DOCX input known characters metadata](https://bugs.launchpad.net/calibre/+bug/1321343)
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DOCX Input: if no language is defined in the metadata, use the language specified in the document default style. Fixes #1321346 [DOCX Input language detection](https://bugs.launchpad.net/calibre/+bug/1321346)