Merge #546

546: shebang handling r=philberty a=dkm

 Mark Wielaard:
> Shebang handling, the first line starting with #! was not done fully
> correct and it isn't necessary to keep track of the shebang line in
> the AST or HIR Crate classes.
> 
> Because an inner attribute also starts with #! the first line isn't
> regarded as a shebang line if the #! is followed by (optional)
> whitespace and comments and a [. In that case the #! is seen as the
> start of an inner attribute.
> 
> I added various testcases that hopefully show the funny things you can
> get when the first line starts with #!.

Co-authored-by: Mark Wielaard <mark@klomp.org>

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