Build libkiwix wasm

[kelson42]

I think this could be really useful for our jacascript ports.

[kelson42]

@mgautierfr @Jaifroid Any opinion?

[Jaifroid]

I'm a bit hazy as to what libkiwix does, as opposed to libzim...

I'm having some difficulties using the libzim in practice, the most serious of which is a memory leak (openzim/javascript-libzim#34)... Therefore, if libkiwix is a superset of libzim, then I think we should probably focus on making libzim robust first. If that can be solved, we'll have the know-how for more ambitious things.

[mgautierfr]

I'm not sure it is needed.
Libkiwix now is more focused on the "management" of zim files (downloading, library handling, server)
I don't know if it is needed in our javascript port.
Everything about creating/reading/searching in zim itself is in libzim.

[kelson42]

@mgautierfr Could you please just update https://github.com/kiwix/libkiwix README.md to give a bullet point driven list of domains where the libkiwix delivers. I have in my mind:

• Bookmark mgmt
• Local/Online library mgmt
• ZIM Download mgmt (via aria2c)
• HTTP daemon

Anything else?

[kelson42]

Therefore, if libkiwix is a superset of libzim, then I think we should probably focus on making libzim robust first.

Libkiwix does not superseed (anymore) the libzim. It's complementary.

Indeed, if libzim wasm integration is not a success then it will be worthless to implement this ticket. This should indeed be validated first.