* refactor: Refactor messagelayer events

* refactor: Refactor drng events

* fix: Fix messagelayer unit tests

* refactor: Refactor value events

* fix: Fix wrong parameter in TransactionBooked event

* refactor: Fix 

* refactor: Rename event parameter structure for consistency

* refactor: Rename parameters

* fix: Fix message tangle unit tests

* refactor: Refactor messagerequester events

* fix: Minor fix

* refactor: Rename Txn to Transaction

* refactor: Rename OutputIDs in ForkEvent to InputIDs

* refactor: Use the pointer of events structure for consistency

* refactor: Minor fix

* upgrade hive.go

* upgrade testify

* fix minor errors

* test that the correct events are triggered

* add test for MissingPayloadReceived event

* remove unused PayloadUnsolidifiable event

* fix TODOs

* Fix: fixed wrong testcase

* Fix: fixed wrong pending parameter in tests

* Feat: added missing PayloadInvalid Event

* upgrade testify

* Feat: propagate payload invalid events

* Feat: added error variables

* Refactor: added missing comment for error

* Refactor: final refactor

Co-authored-by: Hans Moog <hm@mkjc.net>