State List
GET /online/frontend-api/state/?auth_token=&format=api
{ "global": { "volume": 1.0, "stopped": true, "oneshot_volume": 1.0 } }
GET /online/frontend-api/state/?auth_token=&format=api
{ "global": { "volume": 1.0, "stopped": true, "oneshot_volume": 1.0 } }