Remove the "sons" aspect feature

It is currently possible to write sons declarations in aspect files. From looking at the parser it seems like the declarations are similar to the child part of an AST declaration:

sons [A:B] A* C D:E;

The difference is that sons can be declared in an aspect, inside an interface declaration:

aspect Test {
    public interface I {
        sons X:A Y:A Z:A;
    }
}

This is an untested and undocumented feature. I propose that we remove it, by first making it deprecated then removing in the next non-backward compatible release.

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