Sprite manipulation stuff

Types

Sprite = object y*: uint8 ## in pixels x*: uint8 ## in pixels tile*: uint8: Sprite format required by Game Boy hardware.
SpriteFlag {.size: 1.} = enum Bank1Gfx = 0, UseObp1, FlipX, FlipY, Priority
SpriteFlags = object palette* {.bitsize: 3.}: uint8 attributes* {.bitsize: 5.}: set[SpriteFlag]

Vars

Sprites {.importc: "sprites", noinit.}: array[40, Sprite]: _sprites should be defined in static WRAM as the location of the virtual sprite RAM. These sprites will be copied into the actual sprite memory via DMA, run every frame or so.