New Sensors can have 4 character ID

[Glenn Seaton]

I have a new line of sensors firmware that support 4 character Id's (0-9, A-Z, a-z).

The RPI Hat is backward compatible.

I did for some customers that we using a lot of sensors and did not want the sensor ID to be used but once.

I now have over 16M unique Id vs the older 2 character Id of just over 2K unique Ids.

Let me know if there is any interest. 

There are new apps to configure and listen to data. 

Glenn