Update 1.50c: Improvements and Hotfix

- Improvement: Overall posture of the crouching operator when not aiming - Improvement: Camera position in third-person view when the player is moving in a crouched position - Improvement: Reduction in the size of very large textures - Improvement: Optimization of corpse physics - Improvement: Enemy spawn logic in "WAR" and "SIEGE" modes - Fix: Dead or unsconcious bodies kept twitching indefinitely - Fix: "Demolition" objective did not appear correctly on the "Brattvog Village" map - Fix: The canted weapon position remained active when the operator was leaning - Fix: A staircase was impassable for the AI on the "Secret Bunker" map - Fix: A stock for the V4 weapon was not correctly positioned