[hdpowerview] Add properties with firmware information

[jlaur]

Hunter Douglas PowerView firmware information is available for:

• Hub and radio within hub (v2).
• Shade and motor within shade.

Firmware information consists of revision, sub revision and build. Additionally, for the hub itself a name is also available.

This information can be useful:

• To detect v1 or v2 hub by the binding itself to support any incompatibilities.
• When investigating behavioral differences.
• When filing RMA's for faulty products.

For the hub the information can be retrieved with this request:
GET /api/fwversion

Example response for v1 hub:

{
   "firmware":{
      "mainProcessor":{
         "name":"PowerView Hub",
         "revision":1,
         "subRevision":1,
         "build":857
      }
   }
}

Example response for v2 hub:

{
    "firmware": {
        "mainProcessor": {
            "name": "PV Hub2.0",
            "revision": 2,
            "subRevision": 0,
            "build": 1056
        },
        "radio": {
            "revision": 2,
            "subRevision": 0,
            "build": 2610
        }
    }
}

As stated in PowerView-Hub-REST-API-v2.pdf: There are multiple processors in the hub (the primary processor and the Nordic chip for RF processing); the "mainProcessor" sub-key is intended to indicate that the firmware information being returned is for the main processor on the hub, not the Nordic.

Shade firmware information is included in the shade response from:
GET /api/shades/38196

Example:

[...]
        "firmware": {
            "revision": 1,
            "subRevision": 8,
            "build": 1944
        },
        "motor": {
            "revision": 48,
            "subRevision": 51,
            "build": 11825
        },
[...]