[Issue 16539] std.getopt should invoke callbacks in the order given on the command line

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=16539

--- Comment #3 from hsteoh at quickfur.ath.cx ---
Andrei has proposed adding std.getopt.config.commandLineOrder, which must be
the first argument in the list, to switch to this behaviour.

Cf. https://forum.dlang.org/post/p96fmv$20m7$1@digitalmars.com

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