Feature: Add dead cards option for evaluation

[LukeLemes]

Dead cards option for evaluation in games Holdem, Omaha etc.
Added for enabling multi-board evaluation.

I wanted this feature also on cmdline ... do you think we can merge this? ... It helps evaluate double board bomp pots

[andrewprock]

This can't be merged because it will break existing code. We need to add a wrapper that preserves the existing signature so that old code will still compile.

[LukeLemes]

OK ... so the overloading this fce could work, could it not?

[andrewprock]

Using a default argument of the empty set, or creating a separate method would work.