[BUG] - Remove ability to Start Game under Certain Conditions

[LiVinson]

Host should not be able to start the game if:

• All players are not assigned to a team
• There are at least 2 players per team
• There is no more than 1 additional player on a team (e.g. cannot have team with 5 players vs 3 players, but 5 vs 4 is fine)

Determine how to provide feedback to host on why game cannot be started:

• Allow clicking Play, and display error message
• Disable button and display help text based on state of players.