Refactor Level to its own file
Refactor, remove usage of global variables in level.py
Remove usage of global variables at util.py
Refactor diraction to constants file
Refactor option to menu.py
Remove dificulty choice menu
Refactor accept key
Add initial animation to level
Add auto stairs
Refactor get_chsc_callback
Refactor add screen operation
Add alpha color to drawing vertexes
Refactor room floor color to constants
Refactor fadeout to functions module
Refactor game start
Remove callback usage to change screens
Refactor tons of shit and add fade out effect
Refactor main menu code
Refactor quit logic from main.py
Fix back screen exception