Prepare Windows package (*.msix) for Windows11

This issue was first to create both the .msix (for Windows11) AND the .exe (for Windows7/10), but has been splitted in afterward, please look at #1437 for the issue requesting the .exe.

In one of this formats: .msix, .msixbundle, .msixupload, .appx, .appxbundle, .appxupload, .xap

This is necessary to be able to publish on the Microsoft App Store, see #312

Features:

• Package should be installable for only one user https://sourceforge.net/p/kiwix/feature-requests/241/
• Package should be installable for all users (with proper permission escalation)
• *.zim files should be associated to kiwix.exe
• Uninstaller should be provided * msix should be based on the .exe installer (or the other way around) to avoid duplication of effort Seem invalid meanwhile?!
• Details like custom icon for the installer, custom visuals, desktop shortcuts, etc... should be managed
• Everything should be integrated in a headless CD (also the nightlies)... currently in the kiwix/kiwix-build repository
• If possible we should avoid to have to do manual opereration to refresh the config file each time we want to make a new release