Replaces getaway chopper by flying car in L4D2 C8 No Mercy

-ChangeLog-
v1.2
-Remake codes to make it work in l4d2

v1.1.1
-Original Post: https://forums.alliedmods.net/showthread.php?p=2694666

-Convars-
cfg\sourcemod\l4d_flying_car.cfg
/// Custom color (rgb), leave black to use default color
l4d_flying_car_color ""

// Enable/Disable this plugin. 0:disable, 1:enable
l4d_flying_car_enable "1"

// Explode car? 0:disable, 1:enable
l4d_flying_car_explode "1"

// Ignite car on leaving? 0:disable, 1:enable
l4d_flying_car_ignite "1"

// Car model (1:taxi, 2:police car)
l4d_flying_car_model "1"

// Choose color randomly instead using custom one? 0:disable, 1:enable
l4d_flying_car_random_color "1"

// Choose model randomly instead using custom one? 0:disable, 1:enable
l4d_flying_car_random_model "1"