Temperature from alternate sources
Wrapping up what people want in terms of getting the temperature from other sources for use with the "aircon" accessory:

- File - simply a number in a file
- URL - either a number or a JSON payload that you specify
- Broadlink devices including the A1
- HomeKit accessory temperatures

The last time I checked, HomeBridge isn't architectures to allow communication between plugins. This means that this isn't possible at this time.

Ref: #164 and #242

