Added support to clear status areas with <emit resetStatusMessages();>

src/uas/QGCUASFileManager.h

@@ -12,6 +12,7 @@ public:
 
 signals:
     void statusMessage(const QString& msg);
+    void resetStatusMessages();
 
 public slots:
     void receiveMessage(LinkInterface* link, mavlink_message_t message);

src/ui/QGCUASFileView.cc

@@ -17,6 +17,7 @@ QGCUASFileView::QGCUASFileView(QWidget *parent, QGCUASFileManager *manager) :
     connect(ui->downloadButton, SIGNAL(clicked()), this, SLOT(downloadFiles()));
 
     connect(_manager, SIGNAL(statusMessage(QString)), ui->messageArea, SLOT(appendPlainText(QString)));
+    connect(_manager, SIGNAL(resetStatusMessages()), ui->messageArea, SLOT(clear()));
 }
 
 QGCUASFileView::~QGCUASFileView()