Left 4 Dead 2 - Update

An update has been released for Left 4 Dead 2.

Script additions:
- Added "Inflictor" field to damage table for "AllowTakeDamage"
- Director function "WarpAllSurvivorsToCheckpoint"
- Director function "WarpAllSurvivorsToBattlefield"
- Director function "WarpAllSurvivorsToFinale"
Other:
- Updated RocketDude mutation to version 1.7.
- Fixed some typos in talker scripts.