Various simulation fixes; `is_suit()` minor revamp

[KingoftheHomeless]

The is_suit() change has two purposes: to fix simulation of Blackboard (currently counts debuffed Wild Cards as any suit when faithful simulation demands it should use the base suit) and to make it suitable for multi-purpose use (to check for suit-ness either in a scoring context and non-scoring context.) Flower Pot and Seeing Double are not affected by this change due to how they selectively study Wild Cards anyway.

[DivvyCr]

Good fixes, thanks! Tiny things always break whenever I try to restructure/streamline the code..