creates a checkerboard!
Constructor
new (width:Int, height:Int, color0:Int, color1:Int, tile_width:Int, tile_height:Int)
Creates a new checkerboard sprite
* @param width this sprite's width
* @param height this sprite's height
* @param color0 first color
* @param color1 second color
* @param tile_width checkerboard tile width
* @param tile_height checkerboard tile height