rework kodi grabbing mode for all grabbers (#169)

* pull out setgrabbing mode from every grabber into parent class

* implement optional kodi check for v4l

* fix typo

* fix dispmanx build

include/hyperion/GrabberWrapper.h

@@ -6,6 +6,7 @@
 
 #include <utils/Logger.h>
 #include <utils/Components.h>
+#include <utils/GrabbingMode.h>
 #include <hyperion/Hyperion.h>
 
 class ImageProcessor;
@@ -18,17 +19,39 @@ public:
 	
 	virtual ~GrabberWrapper();
 	
+	///
+	/// Starts the grabber wich produces led values with the specified update rate
+	///
 	virtual bool start();
+
+	///
+	/// Stop grabber
+	///
 	virtual void stop();
 
 public slots:
 	void componentStateChanged(const hyperion::Components component, bool enable);
+	
+	///
+	/// virtual method, should perform single frame grab and computes the led-colors
+	///
 	virtual void action() = 0;
 
+	///
+	/// Set the grabbing mode
+	/// @param[in] mode The new grabbing mode
+	///
+	void setGrabbingMode(const GrabbingMode mode);
+
 signals:
 	void emitImage(int priority, const Image<ColorRgb> & image, const int timeout_ms);
 
 protected:
+
+	virtual void kodiPlay();
+	virtual void kodiOff();
+	virtual void kodiPause();
+
 	std::string _grabberName;
 	
 	/// Pointer to Hyperion for writing led values