feat(server): Speed up deletion of childs nodes
feat(server): Speed up deletion of childs nodes

Only check forward references. Add comments.

jpfr/open62541,open62541/open62541,StalderT/open62541,open62541/open62541,StalderT/open62541,open62541/open62541,open62541/open62541,StalderT/open62541,jpfr/open62541,jpfr/open62541,jpfr/open62541,JGrothoff/open62541,JGrothoff/open62541,JGrothoff/open62541,JGrothoff/open62541,StalderT/open62541