Auto merge of #87580 - ChrisDenton:win-arg-parse-2008, r=m-ou-se

Update Windows Argument Parsing

Fixes #44650

The Windows command line is passed to applications [as a single string](https://docs.microsoft.com/en-us/archive/blogs/larryosterman/the-windows-command-line-is-just-a-string) which the application then parses to get a list of arguments. The standard rules (as used by C/C++) for parsing the command line have slightly changed over the years, most recently in 2008 which added new escaping rules.

This PR implements the new rules as [described on MSDN](https://docs.microsoft.com/en-us/cpp/cpp/main-function-command-line-args?view=msvc-160#parsing-c-command-line-arguments) and [further detailed here](https://daviddeley.com/autohotkey/parameters/parameters.htm#WIN). It has been tested against the behaviour of C++ by calling a C++ program that outputs its raw command line and the contents of `argv`. See [my repo](https://github.com/ChrisDenton/winarg/tree/std) if anyone wants to reproduce my work.

For an overview of how this PR changes argument parsing behavior and why we feel it is warranted see https://github.com/rust-lang/rust/pull/87580#issuecomment-893833893.

For some examples see: https://github.com/rust-lang/rust/pull/87580#issuecomment-894299249

library/std/src/lib.rs

@@ -253,6 +253,7 @@
 #![feature(const_ip)]
 #![feature(const_ipv4)]
 #![feature(const_ipv6)]
+#![feature(const_option)]
 #![feature(const_raw_ptr_deref)]
 #![feature(const_socketaddr)]
 #![feature(const_trait_impl)]