Add Facebook instant game export support

[ghost]

Facebook instant game need the Facebook instant game sdk. So please add this sdk. Without the sdk we can't upload our html games

[theraot]

I don't think something like this should be in core. In general these integrations should be plugins. On one hand, not every game and developer will want the integration, and for them it is making the engine and game needlessly heavier. On the other, I'd prefer Godot do not play favorites with third parties.

That SDK is web, right? So we are not talking about integrating a native library, which might require GDNative/GDExtension or compile Godot with a module. Instead, I'd expect it to be JavaScript. So, could you not use it form the JavaScript class?

[ghost]

I haven't tried. Because I haven't tried JavaScript.

if it could be possible then Can you make the plugin?

[Calinou]

There's already a proposal tracking this: #2695

[ghost]

There's already a proposal tracking this: #2695

But they are not working on it. The proposal was maid 10 month ago. But no improvement

[Calinou]

It's likely not technically feasible (see #4120 (comment)).

[eon-s]

The last time I've worked on a FIG project (like a year ago or so), the platform didn't supported webassembly, so it will be impossible if they keep those restrictions.