osx: make use of the 10.8+ user notification center to display growl like notifications

- if 10.8, use user notification center, if <10.8, use growl

Signed-off-by: Jonas Schnelli <jonas.schnelli@include7.ch>

src/qt/macnotificationhandler.h

@@ -0,0 +1,25 @@
+#ifndef MACNOTIFICATIONHANDLER_H
+#define MACNOTIFICATIONHANDLER_H
+#include <QObject>
+
+/** Macintosh-specific notification handler (supports UserNotificationCenter and Growl).
+ */
+class MacNotificationHandler : public QObject
+{
+    Q_OBJECT
+
+public:
+    /** shows a 10.8+ UserNotification in the UserNotificationCenter
+     */
+    void showNotification(const QString &title, const QString &text);
+
+    /** executes AppleScript */
+    void sendAppleScript(const QString &script);
+
+    /** check if OS can handle UserNotifications */
+    bool hasUserNotificationCenterSupport(void);
+    static MacNotificationHandler *instance();
+};
+
+
+#endif // MACNOTIFICATIONHANDLER_H