Decide whether to include additional IMajorityVoting functionality

[JohnGuilding]

We use some functions from IMajorityVoting, such as execute. Some parts are not compatible such as supporting VoteOption.None & VoteOption.Abstain simultaneously. And some we don't use such as vote.

We should decide if we need to implement anymore of the interface and then implement the missing functionality. For example, we might want to implement more sophisticated threshold logic such minApprovalPower.