Fix slice assignment and ensure int() cast is done #119
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I use the slice assignment which was removed (probably by accident) in f80276b.
This restores it.
There is also an issue in sending slices from a numpy array as even a numpy.uint32 is not accepted:
TypeError: in method 'ws2811_led_set', argument 3 of type 'uint32_t'
This could fix #115