High priority event handling

Asset update events should be only triggered on remote servers after the CDB has finished updating.

Processing remote asset update events by CDB before other handlers are called. Remote events are now handled first by high-priority event handlers.This results in an update of the censhare database (CDB). Afterwards these events are passed on to standard handlers. This ensures correct CDB data for AssetAutomations.

Dummy transactions are used to improve CDB cleanup when the server is idle.