Implement red vs. blue pairing

[ianpaschal]

User Story

As a TO, I want to be able to pair players (in solo tournaments) in "red vs. blue" match-ups (Axis vs. Allies, Imperium vs. Xenos, etc.).

Functional Requirements

• New options are available on the <TournamentForm/>:
  • A new pairing method: adjacent_alignment ("Red vs. Blue")
  • A checkbox for: requireDeclareAlignment ("Require players to declare alignment upon registering.")
  • An error is shown if pairingMethod is adjacent_alignment but competitorSize is greater than 1.
• Alignments are shown with a red or blue indicator on TournamentCompetitors.
• The new pairing option is used on the <TournamentPairingsPage/>.

Implementation Details

• TournamentRegistrations will now include a declaredAlignment field.
• TournamentCompetitors will have a calculated field for alignments which is an array, computed based on declared alignments and uploaded lists (when added).
• The pairing algorithm will consider a TournamentCompetitor whose alignments contains a value besides the subject TournamentCompetitor's alignments[0] value as a valid match-up.