encoding/block: Extending interface to allow removal of child items
encoding/block: Extending interface to allow removal of child items

Change-Id: I74acdd7b974ef6ed19ea234c0f30c960a5e7ea8a

cawka/packaging-ndn-cpp-dev,cawka/packaging-ndn-cpp-dev,cawka/packaging-ndn-cpp-dev,cawka/packaging-ndn-cpp-dev