[INCREMENTAL] Respect hierarchy between multiple devices

[rhockenbury]

If a user has multiple devices that report the same weather data fields, only one of those devices weather values will be shown for that field. In that sense, some devices have the ability to take precedence over other devices for certain fields.

The complete sensor hierarchy (for being registered in parallel to the same console) is: (right trumps left)

• outdoor T/H: WH65/WS69 --> WS80 --> WS90 --> WH32
• wind: WH65/WS69 --> WS68 --> WS80 --> WS90
• rain: WH65/WS69 --> WH40 --> WS90 (where with the latter, with latest console firmware, a traditional rain gauge (WH65/WS69 or WH40) can be synoptically registered and displayed with the WS90 piezo rain)