A modern tetris game.

Controls:
    a/d — translate view left and right along view X<br>
    w/s — translate view forward and backward along view Z<br>
    q/e — translate view up and down along view Y<br>
    A/D — rotate view left and right around view Y (yaw)<br>
    W/S — rotate view forward and backward around view X (pitch)<br>
    Q/E — rotate view forward and backward around view Z (roll)<br>
    Left/Right to move piece <br>
    Up to rotate clockwise <br>
    z/x to rotate counterclockwise/clockwise
    Down to soft drop<br>
    Space to hard drop<br>
    C to put piece in/out of hold.


TODO:
- score system modern
- change das and arr
- piece generation should kick up 1 if default pos is occupied
- hold should only work once per piece
- garbage
- 180 spins
- slide