Add support for RainSensor (io:SomfyRainIOSystemSensor)

[ljscz]

Device information
Rain sensor with detected, notDetected states which is used to control covers.

Device details

 {
         "creationTime":1579704509000,
         "lastUpdateTime":1579704509000,
         "label":"dest",
         "shortcut":false,
         "controllableName":"io:SomfyRainIOSystemSensor",
         "definition":{
            "commands":[

            ],
            "states":[
               {
                  "values":[
                     "good",
                     "low",
                     "normal",
                     "verylow"
                  ],
                  "type":"DiscreteState",
                  "qualifiedName":"core:DiscreteRSSILevelState"
               },
               {
                  "type":"ContinuousState",
                  "qualifiedName":"core:RSSILevelState"
               },
               {
                  "values":[
                     "detected",
                     "notDetected"
                  ],
                  "type":"DiscreteState",
                  "qualifiedName":"core:RainState"
               },
               {
                  "values":[
                     "dead",
                     "lowBattery",
                     "maintenanceRequired",
                     "noDefect"
                  ],
                  "type":"DiscreteState",
                  "qualifiedName":"core:SensorDefectState"
               },
               {
                  "values":[
                     "available",
                     "unavailable"
                  ],
                  "type":"DiscreteState",
                  "qualifiedName":"core:StatusState"
               }
            ],
            "dataProperties":[

            ],
            "widgetName":"RainSensor",
            "uiClass":"RainSensor",
            "qualifiedName":"io:SomfyRainIOSystemSensor",
            "type":"SENSOR"
         },
         "states":[
            {
               "name":"core:RainState",
               "type":3,
               "value":"notDetected"
            },
            {
               "name":"core:StatusState",
               "type":3,
               "value":"available"
            },
            {
               "name":"core:DiscreteRSSILevelState",
               "type":3,
               "value":"good"
            },
            {
               "name":"core:RSSILevelState",
               "type":2,
               "value":88.0
            }
         ],
         "available":true,
         "enabled":true,
         "placeOID":"---",
         "widget":"RainSensor",
         "type":2,
         "oid":"--",
         "uiClass":"RainSensor"
      }

[iMicknl]

Thanks for reporting @ljscz! Support for the rain sensor is on its way and will be added after #84 is merged.

If you would like to beta test this functionality, you can download this feature https://github.com/iMicknl/ha-tahoma/archive/refactor_sensor.zip and place this folder in your custom_components folder.

[ljscz]

@iMicknl Thank you for the fast change!

I had to change the sensor type in const.py to

"RainSensor": "binary_sensor",

Without this the sensor was reported as sensor.xxxx and without state after the change it works perfectly.

[iMicknl]

@ljscz good spot, I fixed it now in the latest version. #84 should be published soon, adding support for multiple sensors.