anchor: SpriteBatch:addLayer
  Adds a sprite to a batch created with an Array Texture.
  spriteindex = SpriteBatch:addLayer( layerindex, x, y, r, sx, sy, ox, oy, kx, ky )
  layerindex number The index of the layer to use for this sprite.
  x (0) number The position to draw the sprite (x-axis).
  y (0) number The position to draw the sprite (y-axis).
  r (0) number Orientation (radians).
  sx (1) number Scale factor (x-axis).
  sy (sx) number Scale factor (y-axis).
  ox (0) number Origin offset (x-axis).
  oy (0) number Origin offset (y-axis).
  kx (0) number Shearing factor (x-axis).
  ky (0) number Shearing factor (y-axis).
  spriteindex number The index of the added sprite, for use with SpriteBatch:set or SpriteBatch:setLayer.
  spriteindex = SpriteBatch:addLayer( layerindex, quad, x, y, r, sx, sy, ox, oy, kx, ky )
  layerindex number The index of the layer to use for this sprite.
  quad Quad The subsection of the texture's layer to use when drawing the sprite.
  x (0) number The position to draw the sprite (x-axis).
  y (0) number The position to draw the sprite (y-axis).
  r (0) number Orientation (radians).
  sx (1) number Scale factor (x-axis).
  sy (sx) number Scale factor (y-axis).
  ox (0) number Origin offset (x-axis).
  oy (0) number Origin offset (y-axis).
  kx (0) number Shearing factor (x-axis).
  ky (0) number Shearing factor (y-axis).
  spriteindex number The index of the added sprite, for use with SpriteBatch:set or SpriteBatch:setLayer.
  spriteindex = SpriteBatch:addLayer( layerindex, transform )
  layerindex number The index of the layer to use for this sprite.
  transform Transform A transform object.
  spriteindex number The index of the added sprite, for use with SpriteBatch:set or SpriteBatch:setLayer.
  spriteindex = SpriteBatch:addLayer( layerindex, quad, transform )
  layerindex number The index of the layer to use for this sprite.
  quad Quad The subsection of the texture's layer to use when drawing the sprite.
  transform Transform A transform object.
  spriteindex number The index of the added sprite, for use with SpriteBatch:set or SpriteBatch:setLayer.