Move CInputManager from singleton to CApplication member

The main reason why CInputManager was singleton is the easy access across
the code. That had the negative side effect that time of destruction was
at a very late stage of the shutdown and could not be controlled by us.
My moving it to CApplication, the access is equally easy (using sApp) and
allows to be cleaned up properly during graceful shutdown.

ref T391

src/blackcore/inputmanager.h

@@ -38,6 +38,9 @@ namespace BlackCore
         Q_OBJECT
 
     public:
+        //! Constructor
+        CInputManager(QObject *parent = nullptr);
+
         //! Register new action
         void registerAction(const QString &action, const QPixmap &icon = BlackMisc::CIcons::empty16());
 
@@ -93,9 +96,6 @@ namespace BlackCore
         //! Releases all devices
         void releaseDevices();
 
-        //! Creates a native keyboard handler object
-        static CInputManager *instance();
-
     signals:
         //! Event hotkeyfunction occured
         void remoteActionFromLocal(const QString &action, bool argument);
@@ -109,12 +109,6 @@ namespace BlackCore
         //! New hotkey action is registered
         void hotkeyActionRegistered(const QStringList &actions);
 
-    protected:
-        //! Constructor
-        CInputManager(QObject *parent = nullptr);
-
-
-
     private:
         //! Handle to a bound action
         struct BindInfo