`@scoped_enum` should handle words ending with `y`

[kdheepak]

I'm opening the issue to track a feature request.

[jd-lara]

should also handle words ending in s.

[daniel-thom]

Should we change this macro to work like this? I'm not sure that we can always generate the plural version. I also don't know if we can make the macro work with an optional parameter (in order to avoid breaking the interface).

@scoped_enum Fruits Fruit begin
    APPLE
    ORANGE
end

value = Fruits.APPLE

[jd-lara]

I like the idea of this interface

[daniel-thom]

We don't export this macro anywhere, so we can make the change. The existing uses won't change.