avhai cleanup + grabber list (#402)

* - cleanup shared_avahi stuff
- add a list of avilable grabbers to json server info

* fix compile

include/hyperion/GrabberWrapper.h

@@ -3,6 +3,8 @@
 #include <QObject>
 #include <QTimer>
 #include <string>
+#include <QString>
+#include <QStringList>
 
 #include <utils/Logger.h>
 #include <utils/Components.h>
@@ -15,7 +17,7 @@ class GrabberWrapper : public QObject
 {
 	Q_OBJECT
 public: 
-	GrabberWrapper(std::string grabberName, const int priority, hyperion::Components grabberComponentId=hyperion::COMP_GRABBER);
+	GrabberWrapper(QString grabberName, const int priority, hyperion::Components grabberComponentId=hyperion::COMP_GRABBER);
 	
 	virtual ~GrabberWrapper();
 	
@@ -29,6 +31,8 @@ public:
 	///
 	virtual void stop();
 
+	static QStringList availableGrabbers();
+
 public slots:
 	void componentStateChanged(const hyperion::Components component, bool enable);
 	
@@ -49,7 +53,7 @@ signals:
 protected:
 
 	void setColors(const std::vector<ColorRgb> &ledColors, const int timeout_ms);
-	std::string _grabberName;
+	QString _grabberName;
 	
 	/// Pointer to Hyperion for writing led values
 	Hyperion * _hyperion;