Implement Game Management

[Partyschaum]

General

• Add players
  • No duplicate players
  • Player list is immutable
• Start game
  • Needs at least two players
• End game
• Get winner
• Get current round
• Get current player

Scoring

• Get player's score
• Get used categories for player
• Get unused categories for player

Player's actions

• Player casts dice
• Player casts dice again with fewer dice
• Player registers score