* let the action know its id so that we can get to its factory and option widget.
* added KoActionEventData base class that can be passed to the option widget
* added KoActionEventWidget base that is used for configuring the special event action.
* work on sound action:
* use commands so that undo/redo work
* added option widget
* added way tp get the sound data from the event action
* export sound collection so it can be used in plugins

The new sound event action is not yet used during the presentation.