Allow alias export directive with extern scopes

[Its-Kenta]

Currently only alias export directive possible is if you call it individually outside a namescope and if not inside an extern "C" {} scope:

[export("MyFunction")]
extern "C" fn my_function(): i32;

I think it would be great if you could include the export directive to be part of a the extern scope like this:

[link("mylib")]
namespace lib {
    extern "C" {
        [export("MyFunction")]
        fn my_function(): i32;
    }
}

Meaning extern in the fn get_screen_width(): i32; is unnecessary and allows for bundling all imports in one scope for cleaner code (imo.)

Currently attempting this would give the following error:

=> [syntax]: expect function or variable declaration
    7 | [export("MyFunction")] 
      | ^-here

[Spydr06]

I'll look into it.
It's a bit more complicated to implement rn, since it interferes with how the compiler directives are implemented currently, but it should be doable

[Spydr06]

Fixed this a while ago, this can be closed.