Implement Double Elimination Tournament & Improve Tournament Infrastructure

[hawkerm]

Should improve tournament structure to have TournamentLoader, TournamentGroup, TournmentRound, TournamentStructure

TournamentLoader forms TournamentGroup (should just be a random one and also one that can load from disk), it can also set the Round/Structure and the current scores/positions within each group/round.

Group is just the current set of people to play a around, should be pretty simple?

Round is what controls individual groups and determines who moves in the structure. This may be one round or aggregate rounds or best of x rounds, etc...

Structure is what determines how rounds progress, this can be the advance to final, wildcards, double-elimination, round-robin, etc...