* Update bls_signature_scheme.md with BLS12-381-reversed
* Update DIP3/DIP4 to use BLS operator keys
* Update DIP5 to use BLS keys for user keys
Also add the "Size" column to all serialization specs to align with other DIPs.
* Update BLS primitives serialization size in DIP6/7
* DIP3 - Correct PubKeyOperator type
* DIP4 - Correct PubKeyOperator type
* Remove trailing e from integere