adds dispatcher logic for collective beacons

packages/binary/drng/dispatcher.go

packages/binary/drng/drng.go

packages/binary/drng/events.go

packages/binary/drng/state/options.go

packages/binary/drng/state/state.go

...inary/drng/subtypes/collectiveBeacon/collective_beacon.go

.../drng/subtypes/collectiveBeacon/collective_beacon_test.go

...es/binary/drng/subtypes/collectiveBeacon/events/events.go

...nary/drng/subtypes/collectiveBeacon/events/events_test.go

packages/binary/tangle/model/transaction/transaction.go

plugins/drng/plugin.go