Adafruit-blinka

* Fixes a bug with GPIO settings

This release adds support for Odroid XU4 (and the Odroid XU4Q fanless version).

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://circuitpython.readthedocs.io/projects/blinka/en/latest/) for info on how to use it.

Added Support for GreatFET One

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://circuitpython.readthedocs.io/projects/blinka/en/latest/) for info on how to use it.

Updated libgpiod_pulsein with reduced CPU usage for the Raspberry Pi boards.

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://circuitpython.readthedocs.io/projects/blinka/en/latest/) for info on how to use it.

This release adds support for the Orange Pi 2.

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://circuitpython.readthedocs.io/projects/blinka/en/latest/) for info on how to use it.

This release adds GPIO, I2C, SPI, UART, PWM, and AnalogIn support for the Rock Pi S.

_Note: UART is untested due to issues disabling the console causing a boot loop._

It also adds a few more tools to make it easier to add other boards.

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://circuitpython.readthedocs.io/projects/blinka/en/latest/) for info on how to use it.