Refactor: added ping messages for auto peering and refactored code

plugins/autopeering/server/udp/events.go

plugins/autopeering/server/udp/server.go

plugins/autopeering/server/udp/types.go

plugins/gossip/neighbormanager/accepted_neighbors.go

plugins/gossip/neighbormanager/chosen_neighbors.go

plugins/gossip/neighbormanager/neighbormanager.go

plugins/statusscreen/ui_header_bar.go