ILI9341 Performance Improvements

Thanks!

I think the ILI9341 itself always work, but you may find that the MISO pin (the output from the ILI9341) isn't connected or even brought out on some displays.

On top of this, the Graphics.createCallback function doesn't allow you to specify a getPixel function at the moment, so it'll never work on Espruino unless you're using one of the boards with LCD support compiled into the chip (like the HY ones). You could write your own getPixel function that doesn't go through Graphics and stick it into @DaveNI's module if you desperately wanted though -but the 'Plan B' is probably more desirable as it's faster (and that's kind of the point of his module).