More issues with SHGetFileInfo

More issues were reported on #146 but the poster did not want to create an new issue. This issue tracks those additional enhancements.

SHGetFileInfo is missing the intptr version.

[DllImport("shell32.dll", CharSet = CharSet.Auto)]
public static extern IntPtr SHGetFileInfo(
**IntPtr** pszPath,
uint dwFileAttributes,
ref SHFILEINFO psfi,
uint cbFileInfo,
uint uFlags);
https://learn.microsoft.com/en-us/windows/win32/api/shellapi/nf-shellapi-shgetfileinfoa#shgfi_pidl-0x000000008

KnownFolderId and private const int KEY_PRESSED = 0x8000; are also missed.

https://www.pinvoke.net/default.aspx/user32.getkeystate

Start by reviewing issue #146, the SHGetFileInfo documentation, and the linked GetKeyState reference. Confirm how the metadata represents the intptr SHGetFileInfo variant, KnownFolderId, and KEY_PRESSED; done means those missing API items are included in the generated Win32 metadata.

Written by the indexing model from the issue text.