Surviv.io Zombie Apocalypse v1.2 Release

Big update, not quite as big as v1.1, but big nonetheless, including the following:

• Sound effects tweaked and had volume modifications so that specific sounds aren't louder/quieter than others
• Addition of a full-screen button
• Color of Kill Counter, Time Counter, and Inventory changed to green from orange/red
  
• Weapon balancing changes:
  -     AK47 damage increased to 12 from 9
  -     M9 damage increased from 25 from 20