ISIS-554: reworking dashboard into a @HomePage annotation

[Dan Haywood <da...@haywood-associates.co.uk>]

Folks,

Further to last week's work on this ticket, have developed it a little
further.

Instead of a @Dashboard service, we indicate that precisely (at most) one
domain service action is the @HomePage action.  This can return any object,
eg a view model representing a dashboard, or a simple list, or may even
accept arguments (in which case an action prompt will be automatically
displayed).

For example, in the todo quickstart app, we still see a dashboard; except
it's now a view model:

@Hidden
public class ToDoAppDashboardService extends AbstractService {
    ...
    @ActionSemantics(Of.SAFE)
    @HomePage
    public ToDoAppDashboard lookup() {
        return newViewModelInstance(ToDoAppDashboard.class, ID);
    }
}

public class ToDoAppDashboard extends AbstractViewModel {

    @Named("By Category")
    @Render(Type.EAGERLY)
    public List<ToDoItemsByCategoryViewModel> getAnalysisByCategory() { ...
}

    @Named("By Date Range")
    @Render(Type.EAGERLY)
    public List<ToDoItemsByDateRangeViewModel> getAnalysisByDateRange() {
... }

}


Cheers
Dan