Patch v.1.5.1 - new pew-pew effects

This time some new effects have been added, among some fixes! These include:

• New bullet look. No more pointing lasers!
• Muzzle flash and impact boom on shooting laser
• Hitting targets is now easier: bullets are now more closely following the crosshair, and are generally bigger
• Modified sensitivity setting: the lowest possible sensitivity is now much lower
• Bugfix: audio system error on turned off effects sound