Add an icon constructed from the bee and bamboo assets.
Clean up the blinking code and the constants that drive the character's blinking.
Clean up the collision detection code.

This commit replaces PLAYER_COL_A / 4 and PLAYER_COL_B / 4 with COLLISION_A_HEIGHT / 2 and COLLISION_B_WIDTH / 2 and introduces COLLISION_A_WIDTH and COLLISION_B_HEIGHT.
score.c: Use PRIu32 and SCNu32, from <inttypes.h>, for uint32_t string representations in high score code.