Make file/folder dialogs automatically come to foreground on Windows

[misterbubb]

Fixes the issue where file and folder dialogs would not automatically come to the foreground when opened, requiring users to manually click on them in the taskbar.

Changes

• Modified OpenFileDialog.cs, SaveFileDialog.cs, and OpenFolderDialog.cs to use Windows.GetConsoleWindow() as the owner window handle instead of default (null)
• This associates the dialogs with the console window, ensuring Windows brings them to the foreground automatically

[ds5678]

Does GetConsoleWindow gracefully handle the situation where there is no console window?

[misterbubb]

Does GetConsoleWindow gracefully handle the situation where there is no console window?

Yes, it returns NULL if there's no console, which is the same as the original default value. So it's backward compatible.