Add support to create MSI installers using fragments instead of merge modules
Creating merge modules with wine is not possible so instead of using them for Windows Packages when creating an SDKPackage Wix fragments can be used instead. See: https://github.com/fluendo/cerbero/commit/c60fc2335f18dc9cec1518a0b6358345c77d6e42#diff-a9eea3a878f16426a8460515f6fd0ec6