Implement navigator.epubreadingsystem

[llemeurfr]

see edrlab/thorium-reader#120
and readium/architecture#67

It implies a modification on both the testapp and the navigator.

[mickael-menu]

@JayPanoz Do you think this issue is still relevant for Readium? Is it something that authors expect to have/use?

[JayPanoz]

@mickael-menu At least I’m aware that some authoring tools are making use of this. I’ve occasionally seen authors directly using it too. As far as I can remember in the worst-case scenario, their scripts won’t run at all if it’s undefined.

It was also part of best practices at some point (in books about EPUB 3 production, knowledge bases, &c.), with code examples systematically using it for scripting.

[mickael-menu]

Okay thanks, I'll keep this opened then.

[mickael-menu]

The twin Swift issue containing more details on how to implement this: readium/swift-toolkit#171