refactored SplashScreen: + improved naming, + improved consistency in class interface + replaced timer-based refreshing by lazy-updating (if i'm not mistaken in the WPF rendering mechanism) Related to Issue [WTI-104] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@698 5a3db67b-de53-47b5-99c8-a1c30a6650e2