JSON config support

[plusreed]

Config file would look something like this and would be saved as tkrcfg.json:

{
    "tkrConfigSchemaVersion": 1,
    "config": {
        "db2": {
            "serializeOnBoot": true,
            "serializeCronString": "*/5 * * * *"
        },
        "timeoutMs": 5000,
        "checks": [
            {
                "type": "common",
                "params": [
                    "https://api.prod.hype.space",
                    "hypeapi"
                ]
            },
            {
                "type": "common",
                "params": [
                    "https://ws.prod.hype.space",
                    "hypeapi-websocket"
                ]
            },
            {
                "type": "common",
                "params": [
                    "https://telemetry.prod.hype.space",
                    "api-telemetry"
                ]
            },
            {
                "type": "stream",
                "params": [
                    "internet_high"
                ]
            },
            {
                "type": "stream",
                "params": [
                    "intranet_high"
                ]
            },
            {
                "type": "stream",
                "params": [
                    "wirecast_high"
                ]
            }
        ]
    }
}

[plusreed]

a9d1d18 lays out the structure for parsing the config file without any actual code for now.