Replace a QScopedPointer with the nicer std::unique_ptr

Author: daschuer

src/library/library.cpp

@@ -71,12 +71,11 @@ Library::Library(
           m_pTrackCollectionManager(pTrackCollectionManager),
           m_pSidebarModel(make_parented<SidebarModel>(this)),
           m_pLibraryControl(make_parented<LibraryControl>(this)),
-          m_pLibraryWidget(nullptr) {
+          m_pLibraryWidget(nullptr),
+          m_pKeyNotation(std::make_unique<ControlObject>(
+                  mixxx::library::prefs::kKeyNotationConfigKey)) {
     qRegisterMetaType<LibraryRemovalType>("LibraryRemovalType");
 
-    m_pKeyNotation.reset(
-            new ControlObject(mixxx::library::prefs::kKeyNotationConfigKey));
-
     connect(m_pTrackCollectionManager,
             &TrackCollectionManager::libraryScanFinished,
             this,

src/library/library.h

@@ -204,5 +204,5 @@ class Library: public QObject {
     QFont m_trackTableFont;
     int m_iTrackTableRowHeight;
     bool m_editMetadataSelectedClick;
-    QScopedPointer<ControlObject> m_pKeyNotation;
+    std::unique_ptr<ControlObject> m_pKeyNotation;
 };