Add comic metadata support

[mickael-menu]

There are various popular standards for comic book metadata, especially in the case of CBZs, that are not yet parsed and used to provide comic metadata. These include the ComicRack ComicInfo.xml, ComicBookInfo in the ZIP comment, the Advanced Comic Book Format, as a .acbf file and more.

Useful links:

• https://wiki.mobileread.com/wiki/CBR_and_CBZ#Metadata
• https://github.com/kovidgoyal/calibre
• https://github.com/dickloraine/EmbedComicMetadata

Originally posted by @chocolatkey in readium/go-toolkit#97.