DependencyResolver should update dependencies once for all given items

Current Situation

Currently the DependencyResolver is called internally in the JocInventory.insert or JocInventory.update methods for single items. Those methods are used by different apis, e.g. copy, import, store, restore from trash, git - update from repository. 

The DependencyResolver runs in its own thread with its own database connection to not slow down the parent api calls. The DependencyResolver should not be coupled with those methods, as it occupies a lot of database connections, depending on the item count, which results in the database becoming unresponsive until the connections a freed up again.

Desired Behavior

When the parent apis are finished with their own processing the DependencyResolver has to be called with the collection of items the parent apis have processed. The DependencyResolver has to be removed from the JocInventory.insert and JocInventory.update methods for single items.