Replace vote/remoteVotes functions from all contracts (except alphabet) to
common package. Additionally replace setSerialized and bytesEqual. Create
InitVote function and use it in NeoFS and Netmap contracts.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Create common package. Define Ballot struct in common package. Use new type
in all contracts with ballots.
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
