Core: ProcessReaper code cosmetics

- Rename ReaperPrivate to ProcessReapers
- drop the used ProcessReaper::m_futureInterface
- sprinkle some private and final
- remove unnecessary Q_OBJECT
- remove unnecessary #include, fix accidental user

Change-Id: I2787815975dc80cb93db2132bbfe7ce9a74ebd5f
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/debugger/breakhandler.cpp

@@ -59,16 +59,17 @@
 #endif
 
 #include <QApplication>
-#include <QTimerEvent>
-#include <QDir>
+#include <QCheckBox>
+#include <QComboBox>
 #include <QDebug>
+#include <QDir>
+#include <QFormLayout>
+#include <QGroupBox>
+#include <QMenu>
 #include <QSpinBox>
 #include <QStyledItemDelegate>
-#include <QComboBox>
-#include <QGroupBox>
-#include <QCheckBox>
-#include <QFormLayout>
-#include <QMenu>
+#include <QTimer>
+#include <QTimerEvent>
 
 using namespace Core;
 using namespace ProjectExplorer;