Rename Mlt::Controller::restart to reload

This name better reflects its behavior. Also, make the XML parameter
required since this is used when changing profile/video-mode. You need
to serialize the XML before making that change, before calling this
function.

Author: ddennedy

src/mainwindow.cpp

@@ -3355,7 +3355,7 @@ void MainWindow::cropSource(const QRectF &rect)
         MLT.setPreviewScale(Settings.playerPreviewScale());
         auto xml = MLT.XML();
         emit profileChanged();
-        MLT.restart(xml);
+        MLT.reload(xml);
     }
     emit producerOpened(false);
 }
@@ -4523,7 +4523,7 @@ void MainWindow::onProfileTriggered(QAction *action)
         // Save the XML to get correct in/out points before profile is changed.
         QString xml = MLT.XML(producer);
         setProfile(action->data().toString());
-        MLT.restart(xml);
+        MLT.reload(xml);
         emit producerOpened(false);
     } else {
         Settings.setPlayerProfile(action->data().toString());
@@ -4561,7 +4561,7 @@ void MainWindow::on_actionAddCustomProfile_triggered()
         // Use the new profile.
         emit profileChanged();
         if (!xml.isEmpty()) {
-            MLT.restart(xml);
+            MLT.reload(xml);
             emit producerOpened(false);
         }
     }

src/mltcontroller.cpp

@@ -891,7 +891,7 @@ void Controller::fixLengthProperties(Service &service)
     parser.start(service);
 }
 
-void Controller::restart(const QString &xml)
+void Controller::reload(const QString &xml)
 {
     if (!m_consumer || !m_consumer->is_valid() || !m_producer || !m_producer->is_valid())
         return;

src/mltcontroller.h

@@ -122,7 +122,7 @@ class Controller
     void setIn(int);
     void setOut(int);
     void fixLengthProperties(Service &service);
-    void restart(const QString &xml = "");
+    void reload(const QString &xml);
     void resetURL();
     QImage image(Frame *frame, int width, int height);
     QImage image(Mlt::Producer &producer, int frameNumber, int width, int height);