Integrate with epub3reader project

[Grunthos]

See:

https://github.com/pettarin/epub3reader

it's an early stage OSS epub3 reader and the developers are open to the idea of intent-based inter-app cooperation! Yay!

The idea being:

• define intents usable by any app to access some basic BC functions
• define intents implemented by a reader app to allow BC to query ePub info

ultimately, it would be great to encourage the major readers to implement these intents and support our intents...but in the mean time, if epub3reader keeps developing (and there is every sign it will) then we have a great way to move forward with reader integration.

[White-Owl]

What about FBReader? It is already a mature application with a lot of e-books formats and nice customization.

[Grunthos]

No epub3 support and that means most of my more complex books look terrible, so while I used to use FBReader a lot, now I use readers with good ePub3 support like Moon and Gitden.

FWIW, I have sent messages to the FBReader guys and the Gitden people in the past, but got no response.

The intention here is to define a set of standard interfaces that anyone can implement, not bind ourselves to any one reader. The epub3reader people have a few advantages from my PoV:

• they are open source
• they are actively supporting ePub3
• they seem to know what they are doing
• they responded to questions in a positive way

That said, their project is very young and could go the way of other projects, but by starting to define the means of interaction, none of the work will be wasted (in theory).

[White-Owl]

Hm... But epub3reader does not know how to handle FB2 books, and my e-library is full of them...

[Grunthos]

Once we get a good interface definition working, we will be in a much better place to talk to other projects.

[Grunthos]

Or SkyReader...