Allow begin() without scan

MCP9600 does not like being 'scanned'

1.0.4 Example update

Updated the SPI readwrite example to use SPI

nRF52 support

fix for SPI

Software SPI support

Basic slow bitbang SPI support with LSB/MSB and mode 0/1, and changed some constants for x-compatibility

Doxygen'd library

1.0.1

Update library.properties

Add SPI and rename registers to be generic

Somewhat breaking release, old code will still work but should move to new class names

0.0.3

Update library.properties

Add register abstractions

Now being used in a couple libraries

Library manager init release

doesn't do much yet!