STunney/BobArnson: WIXFEAT:4239

Add option to not extract the .msi when melting .wixpdbs. Don't leave temporary cabinet files behind (unless -notidy is in effect).
Per feedback. Restore Common.DeleteTempFiles and wrap it in AppCommon instead.
Get rid of warning RC4005 by passing in _USING_V110_SDK71_ to rc.exe when necessary.
Set Private to True for the references to
Microsoft.Deployment.WindowsInstaller.dll so that the project will still
build if that DLL is in the GAC.