Build “Winning” Submission Results Filtering

[evanhadfield]

Implement functionality to filter and identify the “winning” submissions based on specified criteria.

This is distinct from "Voting Methods". VotingMethods describe how votes are applied and how they get aggregated, but do not specify criteria for selecting submissions based on votes.

We need a new class to describe the filtering mechanism on submissions based on votes that can be implemented to enable chained-sessions or make it easy to get specific resulting submissions without having to parse all of the result data.