GPIO Module

A module to access the wristband pins and also analog read. This requires adding the necessary calls to Epicardium API (Guide) and creating a c-module for Pycardium (Guide).

In the API-call implementation, you'll need to make use of Maxim's SDK. Docs for that are in lib/sdk/Documentation/html/group__gpio.html & lib/sdk/Documentation/html/group__adc.html.