[w3c/workers] service worker enprovements (#4)

onload/onterminate event is missing
the service worker abstraction could be extended in a more general way :    
the service worker has a short life as now, but it can be waked up from a TriggerObject. A Trigger object  can be a timer or onmessage event from 
   - a channel message (inter web application communications)
   - a server sent message
  -  websocket message     


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