Rework of configuration handling (preparation for config ui)

[bboehmke]

This change reworks the way the configuration is loaded.
The changes are based on the feature/config-basics branch with a different approach to handle the individual entries (currently only meters).

The main focus is based on:

• reduce of duplicated code (no util.DecodeOther to struct in every device)
• reduced complexity (no decorator required anymore)
• define config field metadata via struct tags (defaults, validation, description, ...) see example here

This changes also contains a web API to get the possible value types:

http://127.0.0.1:7070/api/config/types/meter

[
  {
   "name": "modbus",
   "label": "ModBus",
   "fields": [
    {
     "name": "ID",
     "type": "uint8",
     "required": true,
     "label": "ID",
     "default": "1"
    },
    {
     "name": "SubDevice",
     "type": "int",
     "label": "SubDevice"
    },
    {
     "name": "URI",
     "type": "string",
     "label": "URI"
    },
    {
     "name": "Device",
     "type": "string",
     "label": "Device"
    },
    {
     "name": "Comset",
     "type": "string",
     "label": "Comset",
     "enum": [
      "8E1",
      "8N1"
     ]
    },
    {
     "name": "Baudrate",
     "type": "int",
     "label": "Baudrate"
    },
    {
     "name": "RTU",
     "type": "bool",
     "label": "RTU"
    },
    {
     "name": "Model",
     "type": "string",
     "label": "Model"
    },
    {
     "name": "Power",
     "type": "string",
     "label": "Power",
     "default": "Power"
    },
    {
     "name": "Energy",
     "type": "string",
     "label": "Energy"
    },
    {
     "name": "SoCConf",
     "type": "string",
     "label": "SoCConf"
    },
    {
     "name": "Timeout",
     "type": "duration",
     "label": "Timeout"
    }
   ]
  },
  {
   "name": "openwb",
   "label": "openWB",
   "fields": [
    {
     "name": "Broker",
     "type": "string",
     "required": true,
     "label": "Broker"
    },
    {
     "name": "User",
     "type": "string",
     "label": "User"
    },
    {
     "name": "Password",
     "type": "string",
     "label": "Password"
    },
    {
     "name": "ClientID",
     "type": "string",
     "label": "ClientID"
    },
    {
     "name": "Topic",
     "type": "string",
     "label": "Topic",
     "default": "openWB"
    },
    {
     "name": "Timeout",
     "type": "duration",
     "label": "Timeout",
     "default": "15s"
    },
    {
     "name": "Usage",
     "type": "string",
     "required": true,
     "label": "Usage",
     "enum": [
      "grid",
      "pv",
      "battery"
     ]
    }
   ]
  },
  {
   "name": "sma",
   "label": "SMA/Speedwire device (Home Manager/Energy Meter/Inverter)",
   "fields": [
    {
     "name": "URI",
     "type": "string",
     "label": "URI"
    },
    {
     "name": "Interface",
     "type": "string",
     "label": "Name of network interface device is connected to"
    },
    {
     "name": "Password",
     "type": "password",
     "label": "Password",
     "default": "0000"
    },
    {
     "name": "Serial",
     "type": "uint32",
     "label": "Serial"
    },
    {
     "name": "Power",
     "type": "string",
     "hidden": true,
     "label": "Power"
    },
    {
     "name": "Energy",
     "type": "string",
     "hidden": true,
     "label": "Energy"
    },
    {
     "name": "Scale",
     "type": "float64",
     "label": "Scale",
     "default": "1"
    }
   ]
  },
  {
   "name": "tesla",
   "label": "Tesla Powerwall",
   "fields": [
    {
     "name": "URI",
     "type": "string",
     "required": true,
     "label": "URI"
    },
    {
     "name": "Usage",
     "type": "string",
     "required": true,
     "label": "Usage",
     "enum": [
      "grid",
      "pv",
      "battery"
     ]
    },
    {
     "name": "Password",
     "type": "string",
     "required": true,
     "label": "Password"
    }
   ]
  },
  {
   "name": "discovergy",
   "label": "Discovergy",
   "fields": [
    {
     "name": "User",
     "type": "string",
     "required": true,
     "label": "User"
    },
    {
     "name": "Password",
     "type": "string",
     "required": true,
     "label": "Password"
    },
    {
     "name": "Meter",
     "type": "string",
     "label": "Meter"
    },
    {
     "name": "Scale",
     "type": "float64",
     "label": "Scale",
     "default": "1"
    }
   ]
  },
  {
   "name": "default",
   "label": "Generic configurable Meter",
   "fields": [
    {
     "name": "Power",
     "type": "plugin",
     "required": true,
     "label": "Power"
    },
    {
     "name": "Energy",
     "type": "plugin",
     "label": "Energy"
    },
    {
     "name": "CurrentsConf",
     "type": "[]plugin",
     "label": "CurrentsConf"
    },
    {
     "name": "SoCConf",
     "type": "plugin",
     "label": "SoCConf"
    }
   ]
  },
  {
   "name": "custom",
   "label": "Generic configurable Meter",
   "fields": [
    {
     "name": "Power",
     "type": "plugin",
     "required": true,
     "label": "Power"
    },
    {
     "name": "Energy",
     "type": "plugin",
     "label": "Energy"
    },
    {
     "name": "CurrentsConf",
     "type": "[]plugin",
     "label": "CurrentsConf"
    },
    {
     "name": "SoCConf",
     "type": "plugin",
     "label": "SoCConf"
    }
   ]
  }
 ]

TODO:

• Missing objects (charger, vehicles, plugins, ...)
• More meta data (descriptions, validation, ...)

Not Part of this change (done in separate PRs)

• i18n/internationalization
• web ui of config

[andig]

Ich schließe hier mal fürs erste als wontfix wie besprochen. Das Thema nehmen wir später wieder auf.