Allow default constructors for structs

[Dukc]

monkyyy kirjoitti 30.8.2024 klo 15.45:
> 
> .init sucks as a standard, I only ever use it as I have nothing else see 
> my post about .zero (there is **not a standard**, int.init!=float.init, 
> are ranges init even fixable? is nullable.init well defined? is 
> sumtype.init?)
> 
> but this proposal does not maintain a .init "standard"
>

But if it's really going to break the standard, it needs to answer how 
to deal with the resulting complications.