Teams can change colors through a game

[kevinreedy]

Some shuffleboard games have the player change color after a certain number of frames, typically half. The Game model currently doesn't support this.

Tasks:

• Discuss plan on this issue to determine best way to represent data (current model has "yellow_team" and "black_team", how should the frames field work, etc)
• Add field to database to track when a color change happens
• Update tests to check that this is handled correctly
• Update Model to account for the change
• Ensure all game overlay views work with new functionality

[kevinreedy]

They can also switch multiple times, which is currently causing Game.winner to be incorrect.