Support a webpub manifest in an EPUB

[panaC]

especially for divina file

log :

[2]   readium-desktop:main#saga/api/publication/importFromFSService importFromFsService /Users/Pierre/Documents/thorium_ressources/divina/bravery-divina-v1.0.epub +42s
[2]   readium-desktop:main#saga/api/publication/importFromFSService extension .epub +1ms
[2]   readium-desktop:main#saga/api/publication/importFromFSService lcp/lpf/pdf false false false +0ms
[2]   readium-desktop:main/crc /Users/Pierre/Documents/thorium_ressources/divina/bravery-divina-v1.0.epub ad317528feceacc2eed64f8582351ae57c19d685 +42s
[2]   readium-desktop:main#saga/api/publication/import/publicationFromFs importPublicationFromFS /Users/Pierre/Documents/thorium_ressources/divina/bravery-divina-v1.0.epub +0ms
[2]   readium-desktop:main#saga/api/publication/import/publicationFromFs epub extension .epub +0ms
[2]   r2:shared#parser/epub no such path in zip: META-INF/container.xml +0ms
[2]   readium-desktop:main#saga/api/publication/importFromFSService importFromFs (hash + import) fail with :/Users/Pierre/Documents/thorium_ressources/divina/bravery-divina-v1.0.epub no such path in zip: META-INF/container.xml +0ms

need to fix r2-shared-js epub parser to first check the manifest.json file and return it.

[llemeurfr]

The interest of this evolution is to allow hybrid packages, especially those containing comics in EPUB FXL + Divina alternate rendition. The only added component to the EPUB file is the JSON Manifest of the RWPM.