This is now necessary for package type installations so we can know whether or not we should authenticate ahead of time.
Of course, we also verify that the download contains the type of installation we expect (because the appcast is not very trusted).
I need to at least look at:
* Automatic downloaded / silent updates
* Running updates as root user from beginning
* Status info query service
* Add guided flag in the appcast
We now use XPC for communication between Sparkle.framework and Autoupdate.
Autoupdate is now ran as a launchd agaent/daemon. (Most of the time, it acts as an agent).
Using XPC can only be done from non-sandboxed processes, so a connection and status service had to be created.
Currently, the GUI progress tool doesn't work properly, but everything else should be behaving like before.
Zorg