api/system: make stat() call consistent across platforms

[takase1121]

Includes #1826.

This PR uses GetFileAttributesExW on Windows to get everything we need for get_file_info(), including symlink. All platforms will now have symlink and high-resolution timestamps if supported. This should help with #1862.

[Guldoman]

Awesome! With this we could also scale back the autoreload workaround added in #1823.
Would checking if the decimal part of modified is not 0 be enough to determine if the filesystem supports high resolution mtime?

[takase1121]

I am not sure but that should be enough for most use cases. There are also problems with resolution (IIRC all the platforms we are currently supporting won't have this particular issue, though I wouldn't rely on that if I definitively need to know if the system supports high resolution time.

[Guldoman]

I noticed that on non-windows it's possible for type to be nil.
We should either avoid that, or update the documentation.

[takase1121]

I noticed that on non-windows it's possible for type to be nil.
We should either avoid that, or update the documentation.

Can you explain how this would be the case?

UPDATE: misread

[takase1121]

I noticed that on non-windows it's possible for type to be nil. We should either avoid that, or update the documentation.

Avoid that doesn't sound good. I can update the documentation.