Several MinGW compilation issue fixes, and other improvements.

[mcourteaux]

Windows has a case-insensitive file system, but it seems the header files actually have a small-case spelling.

feat(macos): Implement MTLDevice detection.
feat(linux): Get GPU driver version without OpenCL.
fix(build): Windows headers are small letter.
fix(build): Some Windows API use wchar_t.
fix(build): Add include for <sstream>

[lfreist]

Hey, thank you for committing, could you please elaborate why macOS is failing and fix the code formatting?

Thank you!

[mcourteaux]

I don't know why it failed. Internet people seem to suggest that the file should be renamed to end in .mm. However, I tried adding #import <Foundation/Foundation.h> first.

[mcourteaux]

@lfreist Okay, the .mm extension worked. However, the MainBord deprecation is not something I touched. However, I pushed a fix in accordance with apple documentation:

https://developer.apple.com/documentation/iokit/kiomasterportdefault/ (See Discussion section)

[mcourteaux]

Omg. the deprecation note was a lie. Replaced NULL with 0 now.

[lfreist]

I hope this PR won't exceed my free tier GitHub action limit, haha. Joke, thanks for committing!

[mcourteaux]

Okay, maybe I'll grab my macbook, and try for myself to compile this on the actual system. :P This is getting ridiculous. Thanks for dealing with this nonsense 😋

[lfreist]

No problem. I am happy you care about the MacOS support since it's part of hwinfos goal and I don't have a Mac to develop...