Qt5 built in qwt (#570)

- qt4->qt5
- in built qt5 6.1.5 because rhel7 is not upto date with qt5, removed findqwt.cmake
- made a fix in qwt lib (qwt_plot_layout.h) to work with 5.15 and lower versions for qrect constr.
- qt5 forms fixed, qt4 many hard coding forms switched to forms including qtabwidget, scrolls etc, fonts moved to forms
 - docking option enabled by default, removed option to disable docking feature from "Mode"
- added qVersionResolve utility functions to handle compatibility before and after qt5.12
- qtplots (ian's code) takes in gain mode enable to set some settings within the class, with proper gain plot ticks
- ensure gain plots have no zooming of z axis in 2d and y axis in 1d
- removed placeholder text in qpalette in main window form as its not supportd until 5.12 (so using qt5.9 designer insted of qt5.15 to cope)
- tab order
Servers:
- fixed some error messages that were empty for fail in funcs (mostly minor as if this error, major issues)

libs/qwt-6.1.5/include/qwt_panner.h

@@ -0,0 +1,103 @@
+/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
+ * Qwt Widget Library
+ * Copyright (C) 1997   Josef Wilgen
+ * Copyright (C) 2002   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#ifndef QWT_PANNER_H
+#define QWT_PANNER_H 1
+
+#include "qwt_global.h"
+#include <qwidget.h>
+#include <qpixmap.h>
+
+class QCursor;
+
+/*!
+  \brief QwtPanner provides panning of a widget
+
+  QwtPanner grabs the contents of a widget, that can be dragged
+  in all directions. The offset between the start and the end position
+  is emitted by the panned signal.
+
+  QwtPanner grabs the content of the widget into a pixmap and moves
+  the pixmap around, without initiating any repaint events for the widget.
+  Areas, that are not part of content are not painted  while panning.
+  This makes panning fast enough for widgets, where
+  repaints are too slow for mouse movements.
+
+  For widgets, where repaints are very fast it might be better to
+  implement panning manually by mapping mouse events into paint events.
+*/
+class QWT_EXPORT QwtPanner: public QWidget
+{
+    Q_OBJECT
+
+public:
+    QwtPanner( QWidget* parent );
+    virtual ~QwtPanner();
+
+    void setEnabled( bool );
+    bool isEnabled() const;
+
+    void setMouseButton( Qt::MouseButton,
+        Qt::KeyboardModifiers = Qt::NoModifier );
+    void getMouseButton( Qt::MouseButton &button,
+        Qt::KeyboardModifiers & ) const;
+
+    void setAbortKey( int key, Qt::KeyboardModifiers = Qt::NoModifier );
+    void getAbortKey( int &key, Qt::KeyboardModifiers & ) const;
+
+    void setCursor( const QCursor & );
+    const QCursor cursor() const;
+
+    void setOrientations( Qt::Orientations );
+    Qt::Orientations orientations() const;
+
+    bool isOrientationEnabled( Qt::Orientation ) const;
+
+    virtual bool eventFilter( QObject *, QEvent * );
+
+Q_SIGNALS:
+    /*!
+      Signal emitted, when panning is done
+
+      \param dx Offset in horizontal direction
+      \param dy Offset in vertical direction
+    */
+    void panned( int dx, int dy );
+
+    /*!
+      Signal emitted, while the widget moved, but panning
+      is not finished.
+
+      \param dx Offset in horizontal direction
+      \param dy Offset in vertical direction
+    */
+    void moved( int dx, int dy );
+
+protected:
+    virtual void widgetMousePressEvent( QMouseEvent * );
+    virtual void widgetMouseReleaseEvent( QMouseEvent * );
+    virtual void widgetMouseMoveEvent( QMouseEvent * );
+    virtual void widgetKeyPressEvent( QKeyEvent * );
+    virtual void widgetKeyReleaseEvent( QKeyEvent * );
+
+    virtual void paintEvent( QPaintEvent * );
+
+    virtual QBitmap contentsMask() const;
+    virtual QPixmap grab() const;
+
+private:
+#ifndef QT_NO_CURSOR
+    void showCursor( bool );
+#endif
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif