Feature: Support Round Robin style brackets

[Jyckle]

This one turned into a doozy, which I know is bad practice- my brain got a little scattered while pulling these changes together.

Enhancements

• Now supports round robin style brackets (can select when adding the bracket)
• I put some effort into making the calculations repeatable (it now restores the previous SmashNight's end_scores for each person before running all the score change calculations
  • This is big for testing and for preventing the need for a full database restore from backup in prod!
• Significant time reduction and simplification of the matchup table creation (soooo much faster now)
• Removed many of the extra logic files and made the functions model-based
• New strategy for bracket scoring that simplifies the logic and allows us to have multiple brackets of the same rank (required for round robin)
• Updated youtube titles and descriptions for round robin style

[Jyckle]

You weren't kidding about it being a doozy. I like the movement of functionality into the models. Not the deepest dive of a review, but looked good to my skimming

Yeahhhh, got carried away! Thanks for taking a look!