Adafruit-circuitpython-fingerprint

Adds a function set_led() to the library to control the built-in LED for the r503 sensor.


def set_led(self, color=1, mode=3, speed=0x80, cycles=0):
"""LED function -- only for R503 Sensor.
Parameters: See User Manual for full details
color: 1=red, 2=blue, 3=purple
mode: 1-breathe, 2-flash, 3-on, 4-off, 5-fade_on, 6-fade-off
speed: animation speed 0-255
cycles: numbe of time to repeat 0=infinite or 1-255
Returns the packet error code or success"""

Added examples for r503 that demonstrate some led functions.

Details regarding the LED control are in the Users Manual
https://cdn-shop.adafruit.com/product-files/4651/4651_R503+fingerprint+module+user+manual.pdf

Added finger_search() function and modified examples to use it instead of finger_fast_search().
The finger_fast_search does not work on the R503 Panel Mount Fingerprint Sensor.
Modified the examples to use finger_search() so they work with both the R503 Panel Mount FingerPrint Sensor (PID 4651) as well as the Fingerprint Sensor (PID 751).
Also added access to attributes for "system_id" and "status_register".

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).

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

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

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).

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

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

We have upgraded Pylint checks to use the latest version of Pylint and implemented usage of Black Python formatting. This does not change the functionality of the code - it is designed to bring it up to current standards and make it more readable.

* Remove pinned Pylint version number from build.yml file
* Synced `.pylintrc` file to match Adafruit standard
* Ran upgraded Pylint and applied any changes or new disables necessary
* Ran Black formatter and allowed application of changes across entire repo

For more information on using Pylint and Black on your code, check out [this guide on working with Pylint and Black](https://learn.adafruit.com/improve-your-code-with-pylint)

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).

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

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

To use in CircuitPython, simply install the [Adafruit CircuitPython bundle](https://circuitpython.org/libraries).

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

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