* refactors errors

* fmt packages/model/error.go

*  uses workerpool from hive.go

*  removes  internal workerpool

Signed-off-by: Luca Moser <moser.luca@gmail.com>

* fix: use queue for neighbor connection

* refactor: do not request transactions via event

* fix: remove unused connection

* chore: fix linter warnings

* feat: improve gossip events and logs

* fix: log after connection is closed

- lru cache
- soldifier for tangle
- ...