Adafruit-circuitpython-esp32spi

* Added [CircuitPython_RGBLED](https://github.com/adafruit/Adafruit_CircuitPython_RGBLED) compatiblity to `_wifimanager.py`. This allows you to use external RGB LEDs connected to an ESP32 module.

* [Usage example](https://github.com/adafruit/Adafruit_CircuitPython_ESP32SPI/blob/master/examples/esp32spi_aio_post.py#L34)

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-esp32spi`.

Read the [docs](http://circuitpython.readthedocs.io/projects/esp32spi/en/latest/) for info on how to use it.

* Added `PWMOut` class for using any of the ESP32's PWM Pins as `PWMOut` objects. Compatible with [CircuitPython's `PWMOut` API](https://circuitpython.readthedocs.io/en/latest/shared-bindings/pulseio/PWMOut.html#pulseio.PWMOut.deinit), https://github.com/adafruit/Adafruit_CircuitPython_ESP32SPI/pull/52

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-esp32spi`.

Read the [docs](http://circuitpython.readthedocs.io/projects/esp32spi/en/latest/) for info on how to use it.

* Added `DigitalIO` class for using any of the ESP32's GPIO Pins (usages incl.: RGB LEDs, expanding your available GPIO and more!). Compatible with [CircuitPython's `DigitalIO` API](https://circuitpython.readthedocs.io/en/latest/shared-bindings/digitalio/__init__.html), https://github.com/adafruit/Adafruit_CircuitPython_ESP32SPI/pull/51

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-esp32spi`.

Read the [docs](http://circuitpython.readthedocs.io/projects/esp32spi/en/latest/) for info on how to use it.

Added timeout keyword. Thanks anecdata.

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-esp32spi`.

Read the [docs](http://circuitpython.readthedocs.io/projects/esp32spi/en/latest/) for info on how to use it.

* Added timeout to better handle empty or otherwise unexpected returns.

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-esp32spi`.

Read the [docs](http://circuitpython.readthedocs.io/projects/esp32spi/en/latest/) for info on how to use it.

* Updated `simpletest` and `aio_post` examples to predefine externally connected ESP32 modules.
* These examples now default to boards with pre-defined ESP32 pins (i.e: `ESP32_RST`)
* Renamed _PyPortal_ in both examples with a generic name to allow for other boards with `ESP32_Pin` board definitions like the M4 Metro WiFi.

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://github.com/adafruit/Adafruit_CircuitPython_Bundle).

To use in CPython, `pip3 install adafruit-circuitpython-esp32spi`.

Read the [docs](http://circuitpython.readthedocs.io/projects/esp32spi/en/latest/) for info on how to use it.