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_plot_picker.h

@@ -0,0 +1,111 @@
+/* -*- 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_PLOT_PICKER_H
+#define QWT_PLOT_PICKER_H
+
+#include "qwt_global.h"
+#include "qwt_picker.h"
+#include <qvector.h>
+
+class QwtPlot;
+
+/*!
+  \brief QwtPlotPicker provides selections on a plot canvas
+
+  QwtPlotPicker is a QwtPicker tailored for selections on
+  a plot canvas. It is set to a x-Axis and y-Axis and
+  translates all pixel coordinates into this coordinate system.
+*/
+
+class QWT_EXPORT QwtPlotPicker: public QwtPicker
+{
+    Q_OBJECT
+
+public:
+    explicit QwtPlotPicker( QWidget *canvas );
+    virtual ~QwtPlotPicker();
+
+    explicit QwtPlotPicker( int xAxis, int yAxis, QWidget * );
+
+    explicit QwtPlotPicker( int xAxis, int yAxis,
+        RubberBand rubberBand, DisplayMode trackerMode, QWidget * );
+
+    virtual void setAxis( int xAxis, int yAxis );
+
+    int xAxis() const;
+    int yAxis() const;
+
+    QwtPlot *plot();
+    const QwtPlot *plot() const;
+
+    QWidget *canvas();
+    const QWidget *canvas() const;
+
+Q_SIGNALS:
+
+    /*!
+      A signal emitted in case of QwtPickerMachine::PointSelection.
+      \param pos Selected point
+    */
+    void selected( const QPointF &pos );
+
+    /*!
+      A signal emitted in case of QwtPickerMachine::RectSelection.
+      \param rect Selected rectangle
+    */
+    void selected( const QRectF &rect );
+
+    /*!
+      A signal emitting the selected points,
+      at the end of a selection.
+
+      \param pa Selected points
+    */
+    void selected( const QVector<QPointF> &pa );
+
+    /*!
+      A signal emitted when a point has been appended to the selection
+
+      \param pos Position of the appended point.
+      \sa append(). moved()
+    */
+    void appended( const QPointF &pos );
+
+    /*!
+      A signal emitted whenever the last appended point of the
+      selection has been moved.
+
+      \param pos Position of the moved last point of the selection.
+      \sa move(), appended()
+    */
+    void moved( const QPointF &pos );
+
+protected:
+    QRectF scaleRect() const;
+
+    QRectF invTransform( const QRect & ) const;
+    QRect transform( const QRectF & ) const;
+
+    QPointF invTransform( const QPoint & ) const;
+    QPoint transform( const QPointF & ) const;
+
+    virtual QwtText trackerText( const QPoint & ) const;
+    virtual QwtText trackerTextF( const QPointF & ) const;
+
+    virtual void move( const QPoint & );
+    virtual void append( const QPoint & );
+    virtual bool end( bool ok = true );
+
+private:
+    int d_xAxis;
+    int d_yAxis;
+};
+
+#endif