Windows Support

[art-divin]

Context

Current impediments are:

1. https://github.com/apple/swift-package-manager is not compiling for me locally - it says C:\Users\art-divin\Documents\projects\Sourcery\.build\checkouts\swift-llbuild\lib\llvm\Support\include\llvm/Support/FileSystem.h:165:3: error: unknown type name 'uid_t' uid_t fs_st_uid = 0; errors, meaning, for some reason headers from local installation of mingW64 cannot be found 🕵🏻
2. https://github.com/kylef/Commander.git throws CommandRunner.swift:4:10: error: no such module 'Darwin' errors
3. https://github.com/kylef/PathKit.git throws PathKit.swift:8:8: error: no such module 'Darwin' errors on version 1.0.1, while kylef/multi-platform compiles, though it is not 100% working
4. https://github.com/Quick/Nimble.git throws Await.swift:1:8: error: no such module 'CoreFoundation' errors

Strategy

1. Disable swift-package-manager integration for Windows only
2. Commander needs to be removed, replaced with https://github.com/apple/swift-argument-parser
3. PathKit needs to be improved upstream:
   3.1 PathKit: port to Windows kylef/PathKit#86 contains the basis for this to happen
4. Nimble has support since September 2023, version needs to be bumped