v5.0.0-rc.5: Proof Zero Preimage (#778)

* complete move fixtures

* add tower link to genesis preimage, make preimage a fixed 1024 size

* add wizard to add a tower link

* patching e2e tests and tools tests

* more sane fixtures managment for e2e tests

* patch merge

* patch fixtures helpers locations

* remove duplicate fixtures helper

* makefile recipe to backup 0L folder

* bring back info prints

* delay difficulty for stage was off.

* patch globals for vdf difficulty

* rename block_0.json throughout

* skip add_tower when in test mode for onboarding

* patch build