minor improvements (#672)

*  Add syncbeacon to config

*  Refactor syncbeaconfollower

* Fix syncbeacon integration test

*  Fix double-spend tool

*  Fix analysis dashboard title

*  Add Shutdown method to messageRequester

*  Dirty FCOB shutdown fix

*  Add debug logs for message tangle shutdown

*  Fix typo

* 

 Fix message Tangle objects released

* Load all missing messages into message requester on startup

* Fix pointer issue for anonymous function

* Fix consensus integration test

Co-authored-by: jonastheis <mail@jonastheis.de>