Purity Update

Done:

• Add health bar.
• Add map.
• Revise level handling.
• Add cheat code for testing.
• Add Loading screen.
  

Todo:

• Update gun class.
• Make new font file.
  
• Update room file format to include guns and potential other things.
• Make bosses.
  
• Make BMP to Map converter.
• Update/rewrite PurEdit.
• Improve minimap drawing.
  
• Add save point to save point teleportation.