8BitBoy 1.49 - World 2 and 3 design overhaul

Polishing up and improving 8BitBoy in various places. New features and content are coming to an end for now, but there is still small bits that need to be tweaked and polished before I'm satisfied.

• All levels in World 2 has received a major design overhaul.
  
• Run and Shoot is now assigned to one key on both gamepad and keyboard. Keyboard can be configured for three keys still. X and B on gamepad are the same now.
  
• Volume bug fixed. Volume lavels are saved automatically.
  
• Added gradual transition entering hidden places
  
• All new music in bonus levels
  
• Black 8BitBoy was green in bonus levels
  
• Added new or improved hidden places in 2-1, 2-2, 2-3, 2-4, 2-5, 2-6, 2-7, 2-8, 2-9, 3-1, 3-2, 3-3, 3-4, 3-5, 3-6, 4-1, 5-1, 1-5, 1-7
  
• Dying when black in water randomly caused crash - fixed!
  
• Green birds flaps wings when falling and floats slowly through air
  
• Jumping from conveyor belt to falling stone causes insaly fast jump - fixed.