🐛 need to get video start and end times working

This is waiting till service_item_model.rs is the model actually used
for ServiceList. Right now we are still using C++ so once that
switches, we can add it in service_item_model.

This way we don't add anymore C++ code that we are likely to throw away.

src/qml/presenter/PresentationWindow.qml

@@ -59,6 +59,8 @@ Item {
         pdfIndex: SlideObj.slideIndex
         itemType: SlideObj.ty
         vidLoop: SlideObj.looping
+        vidStartTime: SlideObj.videoStartTime
+        vidEndTime: SlideObj.videoEndTime
     }
 
     Connections {