include/gsl/string_span

#pragma once
#pragma message(                                                                                   \
    "This header will soon be removed. Use <gsl/zstring> instead of <gsl/string_span>")
#include "zstring"
Deprecate `<gsl/string_span>` and replace with `<gsl/zstring>` (#1125) With `string_span` having been deprecated (https://github.com/microsoft/GSL/pull/931, https://github.com/microsoft/GSL/pull/945) and removed (https://github.com/microsoft/GSL/pull/1074), the header `<gsl/string_span>` now only contains the definitions for the `zstring` family. Update the name accordingly from `<gsl/string_span>` to `<gsl/zstring>`. The old header is now deprecated and should no longer be used and will be removed in some future release. 2023-06-28 10:48:23 -07:00			`#pragma once`
			`#pragma message( \`
			`"This header will soon be removed. Use <gsl/zstring> instead of <gsl/string_span>")`
			`#include "zstring"`