- Add new content + content key functionality for header by number
- Remove EpochRecords from the network
- Add pruning call for the EpochRecords + required deprecated
functionality
- Adjust getBlock and getBlockHashByNumber to make use of the
new functionality instead
- Delete content_verifier as it was only verifying the now
deprecated EpochRecord
- EpochAccumulator got renamed to EpochRecord
- MasterAccumulator is not HistoricalHashesAccumulator
- The List size for the accumulator got a different maximum which
also result in a different encoding and HTR