Correct BABE randomness by calculating InOut bytes directly in pallet (#5876)

* vrf: remove Raw* types

* babe: remove Raw* types

* pallet-babe: switch representation of RawVRFOutput to Randomness

* pallet-babe: calculate inout within the pallet

* Remove make_transcript duplication

* Bump spec version

* Fix frame tests

* and_then -> map

* Always enable u64_backend

* Fix nostd compile

* fix import: should not use std

* Remove unused definition of RawVRFOutput

* Remove unused import of RuntimeDebug

Co-authored-by: Gavin Wood <gavin@parity.io>