Sprites

[SiXoS]

Enable use of bit sprites. Suggestion on language implementation:

sprite player "images/player.bmp"

// code

run {
    createSprite(10, 10, 100, 100, player) // player is just an alias for some id, createSprite() should return shape
    // more code

Add a note in the docs that creating a very small sprite image and then scaling it up in codes saves a lot of bytecode storage.