Add Neopixel functionality

[hmaarrfk]

This integrates the basic Neopixel LED functionality. The final binary become subject to the LGPL from Adafruit which is unfortunate since we can't dual license.

Anyway, we can move to FastLED in an other PR.

#33

[hmaarrfk]

from teensytoany import TeensyToAny
t = TeensyToAny(serial_number='15219700')
t._ask("neopixel_update_pin 19")
t._ask("neopixel_update_length 5")

t._ask("neopixel_set_pixel_color 0 50 0 0 0")
t._ask("neopixel_set_pixel_color 1 0 50 0 0")
t._ask("neopixel_set_pixel_color 2 0 0 50 0")
t._ask("neopixel_set_pixel_color 3 0 0 0 50")
t._ask("neopixel_set_pixel_color 4 50 50 50 50")
t._ask("neopixel_begin")
t._ask("neopixel_show")

t.close()