update adalight sketch (#299)

* rename platform rpi-pwm to rpi. remove original rpi platform
install symlink to bin folder
create effects folder for custom effects

* fix osx jobs evaluation

* - add rewrite time to serial leds
- rework adalight sketch

* add analog output

* adalight: add analog mode: last led

* tune adalight sketch to final state
move refresh code to leddevice base class, so every leddevice can use it

include/leddevice/LedDevice.h

@@ -12,6 +12,8 @@
 #include <map>
 #include <algorithm>
 
+#include <QTimer>
+
 // Utility includes
 #include <utils/ColorRgb.h>
 #include <utils/ColorRgbw.h>
@@ -81,4 +83,15 @@ protected:
 	static int _ledCount;
 	static int _ledRGBCount;
 	static int _ledRGBWCount;
+
+	/// Timer object which makes sure that led data is written at a minimum rate
+	/// e.g. Adalight device will switch off when it does not receive data at least every 15 seconds
+	QTimer     _refresh_timer;
+
+protected slots:
+	/// Write the last data to the leds again
+	int rewriteLeds();
+
+private:
+	std::vector<ColorRgb> _ledValues;
 };