Grove sensors

Assumes use of Grove RPi Pico Shield with the RPi Pico with the earlephilhower-arduino-pico setup on GitHub.

API

Implemented for DHT11, BME280
Implemented Grove Sensor API:
- String GetPins()/Pin Options
  - List of pins that can be used, such as 16,18,20 with DHT11, or required pins
- String GetListofProperties() as csv list.
- bool Setup(int[] settings)
  - Returns true if setup worked with the supplied settings, the first of which will be the pin/s to be used
  - If no settings, default settings used, which is/are noted in returned GetPins() string.
- bool ReadAll(double[] values)
  - Returns all available properties in the supplied double array.
  - Eg Temperature and Humidity for DHT11
  - Eg Temperature, Humidity and Pressure for BME280
  - Retuns true, or false if failed.
- double Read(enum property)
  - Return just the one nominated property value.
  - If failed return double max
- Restart() , App Done,or Shutdown()
Coming: Grove API for Displays OLED 0.96"and LCD1602