Patch 1.1.7

Fixed escape key not working for some players, preventing the pause menu from opening
Fixed sniper sometimes not being able to fire from some angles when a few zombies where stacked together
Balanced sniper in to counteract its increased firing efficiency and reduce difficulty in some levels
Fixed sniper blood contamination animation not synchronized with the main animation
Fixed incorrect material on the final boss resulting lightning issues
Reduced last boss challenge timing to 2m30s from 5m30s to make it more challenging (it was not)
Changed OpenGL backend on Mac OS to prevent black screens on startup