Add neopxl8 library

Author: jepler

.gitmodules

@@ -926,3 +926,6 @@
 [submodule "libraries/helpers/pastebin"]
 	path = libraries/helpers/pastebin
 	url = https://github.com/adafruit/Adafruit_CircuitPython_Pastebin.git
+[submodule "libraries/drivers/neopxl8"]
+	path = libraries/drivers/neopxl8
+	url = https://github.com/adafruit/Adafruit_CircuitPython_NeoPxl8.git

circuitpython_library_list.md

@@ -125,6 +125,7 @@ There are 308 libraries available.
 * [Adafruit CircuitPython MatrixKeypad](https://github.com/adafruit/Adafruit_CircuitPython_MatrixKeypad.git) ([PyPi](https://pypi.org/project/adafruit-circuitpython-matrixkeypad))
 * [Adafruit CircuitPython NeoPixel SPI](https://github.com/adafruit/Adafruit_CircuitPython_NeoPixel_SPI.git) ([PyPi](https://pypi.org/project/adafruit-circuitpython-neopixel-spi))
 * [Adafruit CircuitPython NeoPixel](https://github.com/adafruit/Adafruit_CircuitPython_NeoPixel.git) ([PyPi](https://pypi.org/project/adafruit-circuitpython-neopixel))
+* [Adafruit CircuitPython NeoPxl8](https://github.com/adafruit/Adafruit_CircuitPython_NeoPixel.git) ([PyPi](https://pypi.org/project/adafruit-circuitpython-neopxl8))
 * [Adafruit CircuitPython NeoTrellis](https://github.com/adafruit/Adafruit_CircuitPython_NeoTrellis) ([PyPi](https://pypi.org/project/adafruit-circuitpython-neotrellis))
 * [Adafruit CircuitPython Nunchuk](https://github.com/adafruit/Adafruit_CircuitPython_Nunchuk.git) ([PyPi](https://pypi.org/project/adafruit-circuitpython-nunchuk))
 * [Adafruit CircuitPython OV2640](https://github.com/adafruit/Adafruit_CircuitPython_OV2640.git) ([PyPi](https://pypi.org/project/adafruit-circuitpython-ov2640))

docs/drivers.rst

@@ -230,6 +230,7 @@ Multi-color LED drivers.
     DotStar <https://circuitpython.readthedocs.io/projects/dotstar/en/latest/>
     NeoPixel <https://circuitpython.readthedocs.io/projects/neopixel/en/latest/>
     NeoPixel SPI <https://circuitpython.readthedocs.io/projects/neopixel_spi/en/latest/>
+    NeoPxl8 <https://docs.circuitpython.org/projects/neopxl8/en/latest/>
     Pixie <https://circuitpython.readthedocs.io/projects/pixie/en/latest/>
     RGB LED <https://circuitpython.readthedocs.io/projects/rgbled/en/latest/>
     WS2801 <https://circuitpython.readthedocs.io/projects/ws2801/en/latest/>