Parry adjustments
Nerf parry deflects by ~ 1 per turn, with limit of 4. NPC's will spawn with the parry buff initialized as appropriate (based on levelup callback).
Greater Weapon Focus converted to use callback, can only trigger once per turn (nerf). Can only trigger on targets in melee range (limits triggering from projection weapons, throwing-knives, etc.).
Fixed bug that could cause NPC's not to initialize trap selection properly.