Left 4 Dead 2 - Update

- Fixed the game and tools not launching on machines with 16+ CPUs. - Fixed missing and incorrect music being played in the L4D1 campaigns - Swamp Fever - The Swamp: Added additional self-terminating survivor-only blockers to the areas above the airplane wreckage to prevent players from skipping the airplane event. These blockers are killed once the airplane door is opened. - Cold Stream South Pine Stream: Added a small blocker next to a crate near the military truck near mid-level to resolve a minor stuck spot. - Fixed controller navigation in mutation menus