using numpy for LED matrix

[paddywwoof]

I am hoping to use the sense hat to display part of a full size image in response to pupil movement. I have modified the sense_hat to use numpy arrays. This is an order of magnitude faster than the python loop methods (alternatively it leaves a lot more processing capacity for the CPU to do other things). It also allows simpler 8x8 arrays of pixels which can be reasonably easily manipulated (i.e. rotation by arbitrary angles etc)

[rzr]

This change should be rebased, is project still maintained?

[paddywwoof]

Hi. My sense hat is still happily running as part of radio alarm so not looked at this code for years. But I'm happy to bring it up to date.