too big diff - no way to commit when not connected to the internet :-(

- VideoWidget on destruction tells xine WILL_DESTROY_DRAWABLE (it was in VideoWidgetXT before which was not the drawable)
- change Events namespace to Event class (QEvent subclass and baseclass for all events used in the backend), the Event objects have a refcount now
- let all down-/upstreamEvent reimplementations call the Source-/SinkNode implementations for event object cleanup
- add code to allow copying custom Event objects
- copy the event before posting it (postEvent takes ownership)
- in SourceNode::downstreamEvent increase refcount of events for each sink it
sends it to
- add safeguard in XT classes to check for early deletion
- add code in XineStream to send arbitrary events downstream
- keep a ref to all XT objects that were mentioned in a connectionChange for 3 seconds to give xine some time to finish the rewiring which happens at some undefined point after the rewire call.

- implicitly deinterlace video when playing a DVD
- make EVENT_SPU_BUTTON (DVD menus) work again
- remove all "<< endl"s
- stop adding a new unusable virtual device per run