Auto/Stealth Ride Import when opening an Athlete

...  import Ride Files automatically from a defined Directory per Athlete
...  runs silently/without "Import Rides" Widget, if the files can be imported/copied/... without error or warning
...  Preferences->Athlete- defines
      ... the directory - per Athlete and- if the function is active at all (default is OFF)
      ... the error handling options
          a) report back ALL errors and warnings by opening the RideImportWizard popup
          b) report back Errors and Warnings - but ignore the "File exists" warning 
              (so that the import directory can be continuously supplied with new files, 
              without the need to remove the already imported ones)

(screen location of the new preferences input fields might need a tweak - was not sure if to put above or below the text box - so decide not to change the current sequence and add below)