Replace QScopedPointer with std::unqiue_ptr

These 2 types are very similar and we should prefer the one from C++
standard library, this reduces the number of types in our code base.

Also see:
https://stackoverflow.com/questions/40346393/should-i-use-qscopedpointer-or-stdunique-ptr#comment67966940_40346991

src/gui/addnewtorrentdialog.h

@@ -29,8 +29,9 @@
 #ifndef ADDNEWTORRENTDIALOG_H
 #define ADDNEWTORRENTDIALOG_H
 
+#include <memory>
+
 #include <QDialog>
-#include <QScopedPointer>
 #include <QShortcut>
 
 #include "base/bittorrent/addtorrentparams.h"
@@ -113,7 +114,7 @@ private:
     BitTorrent::TorrentInfo m_torrentInfo;
     QByteArray m_headerState;
     int m_oldIndex;
-    QScopedPointer<TorrentFileGuard> m_torrentGuard;
+    std::unique_ptr<TorrentFileGuard> m_torrentGuard;
     BitTorrent::AddTorrentParams m_torrentParams;
 };
 

src/gui/fspathedit.cpp

@@ -28,6 +28,8 @@
 
 #include "fspathedit.h"
 
+#include <memory>
+
 #include <QAction>
 #include <QApplication>
 #include <QCoreApplication>
@@ -74,7 +76,7 @@ class FileSystemPathEdit::FileSystemPathEditPrivate
     QString dialogCaptionOrDefault() const;
 
     FileSystemPathEdit *q_ptr;
-    QScopedPointer<Private::FileEditorWithCompletion> m_editor;
+    std::unique_ptr<Private::FileEditorWithCompletion> m_editor;
     QAction *m_browseAction;
     QToolButton *m_browseBtn;
     QString m_fileNameFilter;
@@ -192,7 +194,10 @@ FileSystemPathEdit::FileSystemPathEdit(Private::FileEditorWithCompletion *editor
     connect(d->m_browseAction, &QAction::triggered, this, [this]() { this->d_func()->browseActionTriggered(); });
 }
 
-FileSystemPathEdit::~FileSystemPathEdit() = default;
+FileSystemPathEdit::~FileSystemPathEdit()
+{
+    delete d_ptr;
+}
 
 QString FileSystemPathEdit::selectedPath() const
 {

src/gui/fspathedit.h

@@ -105,7 +105,7 @@ private:
     Q_DISABLE_COPY(FileSystemPathEdit)
     class FileSystemPathEditPrivate;
     Q_DECLARE_PRIVATE(FileSystemPathEdit)
-    QScopedPointer<FileSystemPathEditPrivate> const d_ptr;
+    FileSystemPathEditPrivate *d_ptr;
 };
 
 /// Widget which uses QLineEdit for path editing