Use new folder browser

[reflectronic]

The folder browser used by 7-Zip is still the pre-Vista style dialog created by SHBrowseForFolder:

The code could be modernized to use the new folder browser (perhaps through FolderPicker).

[reflectronic]

Would you take a pull request that implements this?

[AndromedaMelody]

Thanks for your support.
NanaZip doesn't run in AppContainer, and a lots of users need run it as administrator. But Windows.Storage.Pickers can't be used in an elevated application.
You can get more information from microsoft/terminal#8957 & microsoft/terminal#9760 .

[reflectronic]

Hm, that's unfortunate (ref: microsoft/WindowsAppSDK#2504). But, we could just use IFileDialog instead like Windows Terminal does; the end result is almost the same either way.