* adds bootstrap plugin

* check sync state in sync-integration test

* adds synced and bootstrapping plugin to integration test networks

* fix comments

* re-introduce go.mod into integration test dir

* adds desynchronization monitor

* adds shutdown priority for bootstrap plugin bk. worker

* give the dog some pedigree

* adds anchor point cleanup interval

* fix review dog comments

* go mod tidy powered by Marie Kondo

*  Fixes linter warnings

*  removes newline

*  WIP

*  restore folder

*  Fixes integration test

* normalize global plugin vars

* throw the dog a bone

* remove unused logger in drng web api endpoint

* replace 'transaction' with 'message' in message layer pkg

* remove more occurrences of 'transaction'

* fixes ReferencedMessageId() returning approverMessageId

* renames ApprovingMessageId to ApproverMessageId

* use ApproverMessageId in deleteFureCone()

* refactors message pkg

* renames payloadId in Message to contentId

* finalize comment on what a Message is

* refactors additional message sub pkgs

* renames 'transaction' to 'message' in gossip plugin

* removes occurrences of 'transaction' in graph plugin

* removes occurrences of 'transaction' in metrics plugin

* refactors dashboard plugin for messages

* removes further occurrences where tx is used instead of msg

* fixes TestMessageRequest in manager_test.go

* go fmt explorer_routes.go

* fix review comments

* fix Errorf order

* throw around bones