- Fixed error on console on shotgun spas

- Added a new feature, "extra_blood_effect". This is enabled by default. If this is disabled, you'll only see the normal blood effect on the gibbed infected.

- Added some optimization on shotguns on "super_shot_mode = 1".

- Did some adjustments on shotguns to prevent stutter when "Super Shot" chance is set to 100 or high value.

- Slightly modified some scripts.

- Fixed the additional blood splatter showing up even when "Super Shot" wasn't triggered. Now, the additional blood splatter only shows up if "Super Shot" is triggered.