a bog-standard tetris clone based on the one in raylib-examples

i spent a while looking for a gimmick-free tetris implementation because i'm hooked and want to play it when i'm bored. the problem is that none of them seem to work the way i want them to with standard features (like swap storage) AND without having some sort of gimmick that detracts from the classic experience (like Tetris 99 which is multiplayer-only)

controls

R	Rotate piece
←/→	Move left/right
S/↓	Move down
Tab	Swap with storage
P	Pause
Escape	Quit
M	Mute SFX

to do

• balanced pseudorandom piece generation
  • no more than 2 of a kind in a queue of length 5, for example
    • compare [0][0].color to tell what "kind" it is
• gamepad input
• fix graphics
  • readability