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/plugins/clangtools/clangtool.h

@@ -161,7 +161,8 @@ private:
     QAction *m_clear = nullptr;
     QAction *m_expandCollapse = nullptr;
 
-    Utils::Perspective m_perspective{ClangTidyClazyPerspectiveId, tr("Clang-Tidy and Clazy")};
+    Utils::Perspective m_perspective{ClangTidyClazyPerspectiveId,
+                                     ::ClangTools::Internal::ClangTool::tr("Clang-Tidy and Clazy")};
 
 private:
     const QString m_name;