SH Mustard Gas Grenade

1. Fixed possible script errors related to the particle system

1. Possibly fixed the grenade hurting spectators

1. Fixed gas mask breathing sound persisting after death

1. TTT: Fixed gas mask not working...

1. TTT Fix: Fixed Detectives taking no damage from the gas

1. Damage caused by the gas now ignores armor
2. Fixed players taking gas damage even after death

1. Added option ("AllowAmmo") to have multiple Mustard Gas grenades as ammo (on by default)

1. Added option dictating whether players should still take damage after leaving a gas cloud. (Option name: AfterGasTime)

Initial version.