Use Package.Id in WiX v6 to replace UpgradeCode

Author: robmen

examples/quick-start/Package.wxs

@@ -1,6 +1,6 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="QuickStart Example" Manufacturer="ACME Corp"
-           Version="0.0.1" UpgradeCode="PUT-GUID-HERE">
+  <Package Id="AcmeCorp.QuickStartExample" Name="QuickStart Example"
+           Manufacturer="ACME Corp" Version="0.0.1">
     <File Source="example.txt" />
   </Package>
 </Wix>