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ae876a4453
Replaces use of CRT API `getenv` and `putenv` with respectively `_wgetenv` and `_wputenv`. Motivation is to reliably convert environment variables to UTF-8, and the wide API is best there, because it's reliably UTF-16. Changed the hack in `lib/std/private/win_setenv.nim` by switching the order of the Unicode and MBCS environment update; Unicode first, MBCS second. Because `_wgetenv`/`_wputenv` is now used, the Unicode environment will be initialized, so it should always be updated. Stop updating MBCS environment with the name of `getEnv`. It's not necessarily true that MBCS encoding and the `string` encoding is the same. Instead convert UTF-16 to current Windows code page with `wcstombs`, and use that string to update MBCS. Fixes regression in `6b3c77e` that caused `std/envvars.getEnv` or `std/os.getEnv` on Windows to return non-UTF-8 encoded strings. Add tests that test environment variables with Unicode characters in their name or value.