[ecobee] Add support for the Smart Thermostat Premium

[robnielsen]

The new Smart Thermostat Premium provides the following capabilities:

{
  "id": "ei:0",
  "name": "Dining Room",
  "type": "thermostat",
  "inUse": true,
  "capability": [
    {
      "id": "1",
      "type": "temperature",
      "value": "705"
    },
    {
      "id": "2",
      "type": "humidity",
      "value": "50"
    },
    {
      "id": "3",
      "type": "occupancy",
      "value": "false"
    },
    {
      "id": "4",
      "type": "airQualityAccuracy",
      "value": "unknown"
    },
    {
      "id": "5",
      "type": "airQuality",
      "value": "unknown"
    },
    {
      "id": "6",
      "type": "vocPPM",
      "value": "unknown"
    },
    {
      "id": "7",
      "type": "co2PPM",
      "value": "unknown"
    },
    {
      "id": "8",
      "type": "airPressure",
      "value": "unknown"
    }
  ]
}

[mhilbush]

Thanks for the improvements.

LGTM

[lolodomo]

LGTM