WIXFEAT4149

Hello, we want you to present our "lightweight" implementation WIXFEAT4149. In the discussion on the wix-devs, you have not come to a consensus, or discussing labor-intensive solutions. This implementation is easy to develop and support, because it requires minimal modifications as WixStandardBA as themes.
Please rename to SuccessInstallHeader, to match the action. ("SuccessHeader" is the generic one; this is specific to the install action so it should match the ones for repair and uninstall.)