Add deck colors ban in games

[JayDi85]

Add option to ban colors for custom games/tournaments. Current EDH level have hidden option to do that (by special rating values, e.g. 73 will ban 3 - black color), but it must support:

• ban any color;
• ban multiple colors.

Example: users can setup banned symbols in text field like RWUG .

P.S. Current EDH code: