node: added qstringliterals to node IDs

Minor code optimization.

app/node/audio/pan/pan.cpp

@@ -24,7 +24,7 @@ QString PanNode::Name() const
 
 QString PanNode::id() const
 {
-  return "org.olivevideoeditor.Olive.pan";
+  return QStringLiteral("org.olivevideoeditor.Olive.pan");
 }
 
 QString PanNode::Category() const

app/node/audio/volume/volume.cpp

@@ -23,7 +23,7 @@ QString VolumeNode::Name() const
 
 QString VolumeNode::id() const
 {
-  return "org.olivevideoeditor.Olive.volume";
+  return QStringLiteral("org.olivevideoeditor.Olive.volume");
 }
 
 QString VolumeNode::Category() const

app/node/block/clip/clip.cpp

@@ -44,7 +44,7 @@ QString ClipBlock::Name() const
 
 QString ClipBlock::id() const
 {
-  return "org.olivevideoeditor.Olive.clip";
+  return QStringLiteral("org.olivevideoeditor.Olive.clip");
 }
 
 QString ClipBlock::Description() const

app/node/block/gap/gap.cpp

@@ -41,7 +41,7 @@ QString GapBlock::Name() const
 
 QString GapBlock::id() const
 {
-  return "org.olivevideoeditor.Olive.gap";
+  return QStringLiteral("org.olivevideoeditor.Olive.gap");
 }
 
 QString GapBlock::Description() const

app/node/distort/transform/transform.cpp

@@ -59,7 +59,7 @@ QString TransformDistort::Name() const
 
 QString TransformDistort::id() const
 {
-  return "org.olivevideoeditor.Olive.transform";
+  return QStringLiteral("org.olivevideoeditor.Olive.transform");
 }
 
 QString TransformDistort::Category() const

app/node/input/media/audio/audio.cpp

@@ -16,7 +16,7 @@ QString AudioInput::Name() const
 
 QString AudioInput::id() const
 {
-  return "org.olivevideoeditor.Olive.audioinput";
+  return QStringLiteral("org.olivevideoeditor.Olive.audioinput");
 }
 
 QString AudioInput::Category() const

app/node/input/media/video/video.cpp

@@ -27,7 +27,7 @@ QString VideoInput::Name() const
 
 QString VideoInput::id() const
 {
-  return "org.olivevideoeditor.Olive.videoinput";
+  return QStringLiteral("org.olivevideoeditor.Olive.videoinput");
 }
 
 QString VideoInput::Category() const

app/node/output/track/track.cpp

@@ -75,7 +75,7 @@ QString TrackOutput::Name() const
 
 QString TrackOutput::id() const
 {
-  return "org.olivevideoeditor.Olive.track";
+  return QStringLiteral("org.olivevideoeditor.Olive.track");
 }
 
 QString TrackOutput::Category() const

app/node/output/track/tracklist.cpp

@@ -111,7 +111,7 @@ TrackOutput* TrackList::AddTrack()
     if (last_track && last_track->output()->IsConnected()) {
       foreach (NodeEdgePtr edge, last_track->output()->edges()) {
         if (!track_input_->ContainsSubParameter(edge->input())) {
-          Node* blend = NodeFactory::CreateFromID("org.olivevideoeditor.Olive.alphaoverblend");
+          Node* blend = NodeFactory::CreateFromID(QStringLiteral("org.olivevideoeditor.Olive.alphaoverblend"));
           GetParentGraph()->AddNode(blend);
 
           NodeParam::ConnectEdge(track->output(), static_cast<NodeInput*>(blend->GetParameterWithID("blend_in")));

app/node/output/viewer/viewer.cpp

@@ -67,7 +67,7 @@ QString ViewerOutput::Name() const
 
 QString ViewerOutput::id() const
 {
-  return "org.olivevideoeditor.Olive.vieweroutput";
+  return QStringLiteral("org.olivevideoeditor.Olive.vieweroutput");
 }
 
 QString ViewerOutput::Category() const