V1 introduces FeatureParams and deprecates ABCIParams, as fields of ConsensusParams.
As part of the change, ABCIParams.vote_extensions_enabled_height was replaced by FeatureParams.vote_extensions_enabled_height

This issue is open to ensure that networks upgrading from v0.38 to v1 and which have set an enabling height before the migration, do the right thing and move the value from one field to the other.