rm-hull / luma.led_matrix / 11652648542

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improve apa102 display fcn (#296)

* improve apa102 display fcn

Actually for APA102 LEDs, the start-frame needs to be zeros of 32bit size.
For the end-frame n/2 bits needs to be written (n is size of apa102 strip.
This improvement reduces the bytes needed to be written resulting in notable increase of speed.

* fix tests

* fix edge case

* formatting

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Co-authored-by: Richard Hull <rm_hull@yahoo.co.uk>

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