[Issue 13911] rename std.stdio to std.io

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13911

--- Comment #3 from Steven Schveighoffer <schveiguy at yahoo.com> ---
We can do that later. I just don't want to do std.io2, especially after
renaming std.stdio.

My system looks nothing like std.stdio, it will be a very different interface,
with backwards-compatible access via std.stdio.

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