removed default window from AppDelegate and MainMenu since its not needed
MFI-21
+ RefreshTimer – set up a timer that triggers every given time interval
+ Settings.plist – File to store the configuration of the data generator
+ TempValueCalculator – create a more or less random temperature value.

o AppDelegate
	– write the calculated temperature value asynchronously to the Log
	– set up the data generator
o MainMenu – removed unused menu items
o Credits – minor modifications regarding the App's automatically created 'About' view