Fix lupdate issues

- missing Q_DECLARE_TR_FUNCTIONS
- some full qualifications needed for confused lupdate
- avoid breaking some translations from former TaskListPlugin,
  VcsCommand and highlighter settings refactoring

Change-Id: Ia3b34095512a7bad6903f0aff6095313ee39e3e4
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/detailsbutton.h

@@ -5,6 +5,7 @@
 
 #include "utils_global.h"
 
+#include <QCoreApplication>
 #include <QToolButton>
 
 QT_BEGIN_NAMESPACE
@@ -44,6 +45,7 @@ public:
 
 class QTCREATOR_UTILS_EXPORT DetailsButton : public ExpandButton
 {
+    Q_DECLARE_TR_FUNCTIONS(Utils::DetailsButton);
 public:
     DetailsButton(QWidget *parent = nullptr);
     QSize sizeHint() const override;