Remove Online/Offline status from the Explorer

[KMax]

We decided to replace in one of the next versions the online/offline status by the time of the last update and error message if it's. But the first step is to remove the status from the Explorer.

[garayzuev]

SELECT DISTINCT ?label ?uri ?state
WHERE {
   ?uri a ssn:System ;
       saref:hasState ?state ;
       rdfs:label ?label .
}

The above request expects the status of the device.