add idiom 303 Array with non-default lower bound

[simonvonhackewitz]

No description provided.

[maxteufel]

Please re-read the idiom statement:

Declare an array a of integers with six elements, where the first index is 42 and consecutive elements have the indices 43, 44, 45, 46, 47.

[michaellilltokiwa]

I think there is currently no really nice way to do this in fuzion. You can create an issue for this in the fuzion repo.

[simonvonhackewitz]

Personally I think this is not necessary, because this is probably only used in rare cases and if so it should be easy to add a helper feature that subtracts/adds the difference.

Aside from that I think the idiom description can be easily mistaken, I think for the Java implementation the same mistake was made.

But if you think it is important I will add the issue otherwise I think this pull request can be closed.