TipManager & ValueObject factory (#417)

* Add TipManager with naive locking and some basic tests

* Add ValueObjectFactory

* Bones

* Refactor TipManager to be able to handle tips in the context of branches

* Add unit tests

* Add more tests

* Feat: initial commit

* Feat: added setPreferred to TransactionMetadata

* Feat: added a Conflicting() method to the transactionMetadata

* Fix: fixed logic bug

* Feat: refactored fcob

* Refactor: refactored additional code

* Fix: fixed a bug in ForeachConsumers

* Refactor: cleaned up code

* Feat: implemented FCOB consensus into the valuetransfer dapp

* Refactor: refactored FCOB

* Docs: added some additional comments

* Docs: fixed comments

* Refactor: commit before branch change

* Feat: added PayloadLiked Event

* Refactor: fixed some missing comments + added liked to marshal

* Feat: reworked the preferred and liked propagation

* Refactor: cleaned up some logic

* Refactor: simplified code

* Refactor: cleaned up more stuff :P

* Refactor: refactor

* Feat: moved test + refactored fcob

* Fix: fixed a few bugs in liked propagation

* Rewrite TipManager to maintain a simple flat map of tips. The value transfers plugin needs to call the corresponding functions AddTip and RemoveTip when a value object is liked or disliked, respectively.

* adapt to new hive.go version

* upgrade hive.go

* Feat: started implementing a wallet

* Feat: extended wallet files

* Integrate tipmanager on tangle events

* Rename TipCount to Size

Co-authored-by: Wolfgang Welz <welzwo@gmail.com>
Co-authored-by: Hans Moog <hm@mkjc.net>