Big update

• Upgrade System with cards!
  • Added cards every 5 rounds that allow you to upgrade your base/character
  • Available cards are, buckshot, reload speed, clipsize, health, accuracy and a few base upgrades.
  • A few upgrades are incomplete and are nonfunctional (see turret/tripmines/clipsize)
  • It's very early but still wanted to shipit as a proof of concept and to gather feedback.
  • Please leave feedback on the card system
• New sounds on monsters/weapons/menu items
• A secret character
• Feedback soudns on menu items and rooms no longer change instantly.
• Vortigaunts now deal damage properly.