added icon for RemoveDefenderTrait trait

fixed missing activation for CounterAttackOnDodgeTrait
fixed bug that dodge didn't have any effect
fixed NullReferenceException when pressing escape and card selected
some minor balancing changes
nerfed cards with dodge (SkeletonAssassin and Wolf)
added twister spells: Poison, Fire, Frost
added Horror cards: Poison, Frost, Fire
some minor balancing changes to spell cards
added immunity cards: Fire, Frost, Poison
added chain lightning spells: Poison, Frost, Fire

fixed bug in HexMap.GetNeighbours(T item, int distance) that also returned the item when distance>1)
added spell ChainLightningHeal
fixed description of LesserAcidBall spell

fixed effect of TwisterPoison spell
added spell cards to beast and undead decks