Update 1.2.67

ADD: American tropical and British winter unit portraits by jkprince

CNG: Updated unit data for the Japanese Type 91 Armoured Car

FIX: Changed 'tank' to 'vehicle' in several strings FIX: When the player unit was hit by an attack and a crewman knocked unconscious, their command was not set to None, so in the case of an Overrun attack they were still able to act in that turn's Shooting phase FIX: No longer possible to inadvertantly advance into the next Scenario phase while hex view mode is active FIX: Expert Shot now replaces Crack Shot in a crewman's skill list