Support Environment node
Either I'm missing something or msitools does not support Environnment node: https://wixtoolset.org/documentation/manual/v3/xsd/wix/environment.html
Running wixl 0.98 and 0.99 on wxs file which defines Environment inside Component fails with
wixl-ERROR **: 10:29:30.475: wix.vala:218: unhandled child Component node Environment