micro:bit OneWire Library
Based upon Erik Olieman's mbed DS1820 lib
https://developer.mbed.org/components/DS1820/
Modified timings so that it works when used on the Micro:Bit.
Added off device test code with mocks and its own cmake configuration.
Modified API's for two stage workflow:
- Listing of devices with addresses to be stored elsewhere
- Returning temperatures for each device by address