implement growl notifications

[hohwille]

UiNotifier.notify* methods currently only delegate to Window.alert.
A proper growl implementation should be added to ui-demo (and later to archetype or according tvm lib) and used instead of alert.
Further, it would be nice to keep a history of the notifications and allow an build-in popup dialog to be opened showing a data table with all the notifications ordered by timestamp of occurrence with filtering and all these features.