* Remove verifySignatures from ProposerSlashings
* Remove flag from process transfers
* resolve all conflicts
* fix more references to old pbs
* Fix merge conflicts
* Remove verifySignature flag from ProcessBlockHeader
* fx spectest
* Fix test errors
* Fix tests
* Fix tests
* Goimports
* Fix test finally
* Move test helpers to testutil
* Goimports
* Fix imports
* Add tests for new helpers
* Run gazelle
* Fix tests
