add suport for CreateMonitoredItemsRequest
use addon directly instead of application in high level opcua client object
Renamed AddressSpaceServices to NodeManagementServices.
Merge remote-tracking branch 'olivier-merge/master' into olivier

Conflicts:
	include/opc/ua/client/client.h
	src/client.cpp
Buildfix of CreateMonitoredItems changes.
Merged CreateMonitoredItems.