WIP: Remove unused location data from request payload

[n3tr]

Configure locationTemplate option to remove unused (need to confirm) data in the location payload that get sent to server.

Before

{
  "coords": {
    "speed_accuracy": 0,
    "speed": 6.5899999999999999,
    "longitude": -122.02329798,
    "floor": 0,
    "heading_accuracy": 0,
    "latitude": 37.332160719999997,
    "accuracy": 10,
    "altitude_accuracy": -1,
    "altitude": 0,
    "heading": 347.52999999999997
  },
  "extras": {},
  "is_moving": true,
  "odometer": 1583.2,
  "uuid": "55FF6745-4786-4D72-A3CC-ED52067E0E4A",
  "activity": { "type": "unknown", "confidence": 100 },
  "battery": { "level": -1, "is_charging": false },
  "timestamp": "2021-01-17T08:32:27.572Z"
}

After

{
  "coords": {
    "latitude": 37.333285240000002,
    "longitude": -122.0415168,
    "accuracy": 10
  },
  "timestamp": "2021-01-18T13:22:52.333Z",
  "uuid": "3C817E1F-33E6-4920-B3F8-DF46BEC99023"
}

For 20 location records, the size reduce from ~11.5 KB to ~4.11 KB