Update 0.3

Changelog:

• The third area of the dungeon, with a new environment, traps, enemies and a Boss.
  
• Improved behavior of some enemies.
• Added a class system. At the moment, there are three basic classes available - Stranger, Wizard and Warrior, each with its own unique skill.
  
• Expanded hub location. Added a Merchant Tent that allows you to buy items before going into the dungeon.
  
• Added flooded areas on levels.
  
• New negative effect - Burning.
• Dark Idols are objects that appear on levels and apply a negative effect until they are destroyed.
  
• Lots of minor fixes and improvements.