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_raster_data.h

@@ -0,0 +1,95 @@
+/* -*- 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_RASTER_DATA_H
+#define QWT_RASTER_DATA_H 1
+
+#include "qwt_global.h"
+#include "qwt_interval.h"
+#include <qmap.h>
+#include <qlist.h>
+#include <qpolygon.h>
+
+class QwtScaleMap;
+
+/*!
+  \brief QwtRasterData defines an interface to any type of raster data.
+
+  QwtRasterData is an abstract interface, that is used by
+  QwtPlotRasterItem to find the values at the pixels of its raster.
+
+  Often a raster item is used to display values from a matrix. Then the
+  derived raster data class needs to implement some sort of resampling,
+  that maps the raster of the matrix into the requested raster of
+  the raster item ( depending on resolution and scales of the canvas ).
+*/
+class QWT_EXPORT QwtRasterData
+{
+public:
+    //! Contour lines
+    typedef QMap<double, QPolygonF> ContourLines;
+
+    //! Flags to modify the contour algorithm
+    enum ConrecFlag
+    {
+        //! Ignore all vertices on the same level
+        IgnoreAllVerticesOnLevel = 0x01,
+
+        //! Ignore all values, that are out of range
+        IgnoreOutOfRange = 0x02
+    };
+
+    //! Flags to modify the contour algorithm
+    typedef QFlags<ConrecFlag> ConrecFlags;
+
+    QwtRasterData();
+    virtual ~QwtRasterData();
+
+    virtual void setInterval( Qt::Axis, const QwtInterval & );
+    const QwtInterval &interval(Qt::Axis) const;
+
+    virtual QRectF pixelHint( const QRectF & ) const;
+
+    virtual void initRaster( const QRectF &, const QSize& raster );
+    virtual void discardRaster();
+
+    /*!
+       \return the value at a raster position
+       \param x X value in plot coordinates
+       \param y Y value in plot coordinates
+    */
+    virtual double value( double x, double y ) const = 0;
+
+    virtual ContourLines contourLines( const QRectF &rect,
+        const QSize &raster, const QList<double> &levels,
+        ConrecFlags ) const;
+
+    class Contour3DPoint;
+    class ContourPlane;
+
+private:
+    // Disabled copy constructor and operator=
+    QwtRasterData( const QwtRasterData & );
+    QwtRasterData &operator=( const QwtRasterData & );
+
+    QwtInterval d_intervals[3];
+};
+
+/*!
+   \return Bounding interval for a axis
+   \sa setInterval
+*/
+inline const QwtInterval &QwtRasterData::interval( Qt::Axis axis) const
+{
+    return d_intervals[axis];
+}
+
+Q_DECLARE_OPERATORS_FOR_FLAGS( QwtRasterData::ConrecFlags )
+
+#endif