Fixed window flashing on new items

The FieldLogViewer window would not flash anymore on new items if it was activated while no more items arrived. This state is now correctly reset on window activation so it can flash again on the next item.

Also, the flashing now immediately stops when the window is activated.

Created the batch activity test in the ConsoleDemo application to have some time between log items.
Scrolling improvements

* When scrolling up, a running scroll-down animation is immediately stopped
* Scrolling in the items list regards mouse wheel acceleration provided by the mouse driver
* Fixed occasional scrolling the items list to the end although it was far away from the end
Scrollmap was missing on startup in fullscreen mode