add mouseMove signal to SignalLabel

Make use of the mouseMove signal in SplitHeader for the stream uptime
tooltip

src/widgets/helper/splitheader.cpp

@@ -57,6 +57,7 @@ SplitHeader::SplitHeader(Split *_split)
         title->setMouseTracking(true);
         QObject::connect(this->titleLabel, &SignalLabel::mouseDoubleClick, this,
                          &SplitHeader::mouseDoubleClickEvent);
+        QObject::connect(this->titleLabel, &SignalLabel::mouseMove, this, &SplitHeader::mouseMoveEvent);
 
         layout->addStretch(1);