Refactors LookupManager to not need a LookupSplitter

NodeLookup actors are now "one-off", creating one actor for each request.
Adds the ValueLookup actor and respective usage in LookupManager
Fixes wrong message being sent to the LookupValue actor
Minor change (shouldn't affect anything)
Fixes the ValueLookup Actor
Adds the GetFromNetworkActor and points the KadActNode to it when looking for a value in the network
Activates previously ignored test, now that it is implemented
Adds more tests to the KadActNetwork

Currently, there is something wrong as values are not being found in the whole network