Adjusted M2 turret from 1.0 to 1.9 and laser turret from 0.4 to 0.8
As most standard zombies health values will range from 1.4 - 1.8 this will make the M2 turret kill each standard zombie after 1 shot while being multiple shots for people playing on harder difficulties or mods (such as random zombies).

Changed damage values for both turrets, M2 turret damaged from 0.4 to 1.0 and laser turret changed from 0.2 to 0.4