refactor states constants
code cleanning
Doubled the score image digit size. Also, discovered a bug in the draw_score() function. Turns out there are too many loops running when the score becomes greater than 9, making the framerate drop. I patched this.

Signed-off-by: shrimpboyho <shrimpboyhoftw@gmail.com>
Added function that sets the anchor point of the bird_sprites to the center of the actual image of the bird. Therefore, the collision detection system needs to take this into account. The bird bouncing up and down on the title screen has also stopped working as a result of this. This needs to be fixed. However, the changing angle of the bird due to gravity looks more realistic since it is rotated around the actual center of the sprite.
improves, fixes
game over scene, new audios, refactor pipes, base class sprObj for important sprites, etc
game over scene, new audios, refactor pipes, base class sprObj for important sprites, etc
sounds, player jump animation, refactors
fixes