Change Notes:

- Replaced "boss zombie" with "armored zombie".
- Added new zombie type "armored zombie".
- Replaced gun model with higher resolution M-16.
- Added advanced first-person animations.
- Added new gun sound effects.
- Changed muzzle flash.
- Improved spawn system to increase performance.
- Changed spawn system to increase spawn rate of certain zombies to increase difficulty more exponentially.
- Added new gun reload effects.
- Removed unused assets.
- Patched additional exploits.
- Moved patches of grass to improve map look.
- Added directional light to represent sky map.
- Increased brightness slightly.
- Added siren that plays at the end of each round.