Spawn L4D1 Survivors

An add-on vscript that will grant the player to have L4D1 survivors in any chosen campaigns, making them unstoppable. An extension is also added if you intended to play the Official L4D1 campaigns with all of them.
- Modified CI and Special Infected health and spawn rate for balanced gameplay. – (V9.1)
- Reworked code for fixing Zoey’s Invulnerability bot after the map transition. – (V6.0)

- Not supported on Custom L4D1 Campaigns.
- T-pose bug for Zoey and Francis in the Passing.
- Messed up end credits after successfully escape at finale.
- Unplayable L4D1 survivors: "Bill, Zoey, Francis, Louis"
