Update 1.54c: Improvements

Addition: New gameplay option - Dark Night

Addition: Character selected in Photo Mode during a mission is now highlighted for better visibility

Addition: Camera movement when switching firearms

Improvement: Distant gunfire sound propagation

Improvement: Optimized environmental light reflections

Fix: Role-icon display error when no role is assigned

Fix: Enemy AI could sometimes fail to stop their ambient animations correctly when they became alert

Fix: AI navigation error on certain stairs

Fix: Destroyed vehicles in the map editor could sometimes not be selected