Minor fixes and adding more JSON and parsing options

[andermatt64]

• Fixed typo with populatepublicvars
• Added generated files JAERO and moc_predefs.h to git ignore
• Added option to only use libacars library to parse downlink ADS messages
• Added option to output JSON format (JSON4) similar to @szpajder 's dumphfdl and dumpvdl2
• libacars decoded messages will exposed as JSON objects if in JSON4 format
• Added settings options for inputting station ID (default is hostname)

Settings Dialog

Example JSON

{
  "app": {
    "name": "JAERO",
    "ver": "v1.0.4.13"
  },
  "isu": {
    "acars": {
      "ack": "!",
      "arinc622": {
        "adsc": {
          "err": false,
          "tags": [
            {
              "wpt_change_event": {
                "alt": 36000,
                "lat": 51.001282,
                "lon": -30.005379,
                "nav_redundancy": true,
                "pos_accuracy_nm": 0.25,
                "tcas_avail": true,
                "ts_sec": 742
              }
            },
            {
              "predicted_route": {
                "next_next_wpt": {
                  "alt": 36000,
                  "lat": 50.999908,
                  "lon": -49.999981
                },
                "next_wpt": {
                  "alt": 36000,
                  "eta_sec": 3026,
                  "lat": 50.999908,
                  "lon": -40.000019
                }
              }
            }
          ]
        },
        "air_addr": ".D-AIHV",
        "crc_ok": true,
        "gs_addr": "PIKCPYA",
        "msg_type": "adsc_msg"
      },
      "blk_id": "7",
      "flight": "LH424",
      "label": "B6",
      "mode": "2",
      "msg_text": "J30ALH0424/PIKCPYA.ADS.D-AIHV14244487554D88CA0B981D0D2444471C71C8CA0BD2244446E38E48CA0097F3",
      "reg": "D-AIHV"
    },
    "dst": {
      "addr": "43",
      "type": "Ground Earth Station"
    },
    "qno": "07",
    "refno": "08",
    "src": {
      "addr": "3C6516",
      "type": "Aircraft Earth Station"
    }
  },
  "station": "jetson",
  "t": {
    "sec": 1665545421,
    "usec": 58000
  }
}

[kevinelliott]

Nice additions. I'd love to see this happen. Would be good to have the JSON keys match in case, but also to come even closer to @szpajder 's dump format (if possible) overall!

[kevinelliott]

Since we have the app element that indicates jaero and version, do you think the top level jaero element is necessary? I suppose since dumpvdl2 has the vdl2 top level element, this matches that.

[andermatt64]

Since we have the app element that indicates jaero and version, do you think the top level jaero element is necessary?

Practically speaking, I don't think it's necessary. I put it in just to closer match the dump JSON format

[kevinelliott]

@andermatt64 This is some really great work. Thanks for taking all of our feedback here and on the ADSBX Discord.

[andermatt64]

Looks good to me! I think you could add seqno too.

I tried adding it but the value seems to be always 00. I suspect it may be a value used internally to reassemble fragmented messages