Add optional support for SH1106 OLED

[jrsphoto]

While designing an enclosure for my Adruheater, I designed an alternative cover that includes mounting space for a SH1106 OLED display. The I2C pins on the Nano are A5 & A4, which your conveniently not using, and I simply added connection to A4/A5 and 3.3v/GND connections. pretty simple.

My thinking was it would be nice to have the display show current temp/humidity/dew point and channel status.

[jrsphoto]

This is the case: https://a360.co/3ycqrrV