refresh time for all devices + schema fixes (#305)

* refresh for all :-)
remove dups

* - integrate refresh leds for all devices
- fix schemas for led devices

* add minimum for rewrite time

* rewriteTime: add missing info in config examples

libsrc/leddevice/LedDeviceLightpack.cpp

@@ -71,6 +71,7 @@ LedDeviceLightpack::~LedDeviceLightpack()
 
 bool LedDeviceLightpack::init(const QJsonObject &deviceConfig)
 {
+	LedDevice::init(deviceConfig);
 	_serialNumber = deviceConfig["output"].toString("").toStdString();
 
 	return true;