* No need to instantiate SecureRandom on sign() calls
* Increase gradle daemon heap

* Optimize GossipRouter.mergeMessageParts(): extract RpcPartsQueue as a separate class

* Make GossipRouter.score property overridable
* Extract 2 interfaces GossipRouterEventListener and GossipScore. Rename implementation to DefaultGossipScore
* Make them deal with PeerId instead of PeerHandler
* To retain the possibility to access PeerHandler add P2PService:.peerIdToPeerHandlerMap
* P2PService: hide mutable collections, expose immutable

* extract GossipRouterBuilder
* Move property declarations right after primary constructor (which may also declare properties) in changed classes
* Refactor AbstractRouter.addPeerWithDebugHandler() workaround
* Remove pubsub interface var properties
* Adjust tests

* Modifies the algorithm to O(n) complexity
* Extracts the PeerIP class (which could be adjusted to IPv6 and colocation criteria later)
* Pass more specific Multiaddr type for the onConnected() event