Zombie Survival Game v5.0

v5.0 Massive Changes & Updates - Over 100+ Commits! 🎆

1. All global variables have been removed and replaced by using classes now.
2. The merchant offers 2 new weapons and 2 new consumables to bring your health back up!
3. Added in-game unlockable achievements.
4. Added a hidden cheat code.
5. Players now have access to greatly improved audio options.
6. Added in-game checkpoints so that players can save their game and pick up where they left off.
7. Added a setup.py file.
8. Values that are randomized in-game are greatly improved and balanced.
9. Players can now view their stats in-game.

Major thank you to @amastis & @crazyguy42781 for testing and helping push this release out with so many new features!