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_point_mapper.h

@@ -0,0 +1,89 @@
+/* -*- 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_POINT_MAPPER_H
+#define QWT_POINT_MAPPER_H
+
+#include "qwt_global.h"
+#include "qwt_series_data.h"
+#include <qimage.h>
+
+class QwtScaleMap;
+class QPolygonF;
+class QPolygon;
+
+/*!
+  \brief A helper class for translating a series of points
+
+  QwtPointMapper is a collection of methods and optimizations
+  for translating a series of points into paint device coordinates.
+  It is used by QwtPlotCurve but might also be useful for
+  similar plot items displaying a QwtSeriesData<QPointF>.
+ */
+class QWT_EXPORT QwtPointMapper
+{
+public:
+    /*!
+      \brief Flags affecting the transformation process
+      \sa setFlag(), setFlags()
+     */
+    enum TransformationFlag
+    {
+        //! Round points to integer values
+        RoundPoints = 0x01,
+
+        /*!
+          Try to remove points, that are translated to the
+          same position.
+         */
+        WeedOutPoints = 0x02
+    };
+
+    /*!
+      \brief Flags affecting the transformation process
+      \sa setFlag(), setFlags()
+     */
+    typedef QFlags<TransformationFlag> TransformationFlags;
+
+    QwtPointMapper();
+    ~QwtPointMapper();
+
+    void setFlags( TransformationFlags );
+    TransformationFlags flags() const;
+
+    void setFlag( TransformationFlag, bool on = true );
+    bool testFlag( TransformationFlag ) const;
+
+    void setBoundingRect( const QRectF & );
+    QRectF boundingRect() const;
+
+    QPolygonF toPolygonF( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QwtSeriesData<QPointF> *series, int from, int to ) const;
+
+    QPolygon toPolygon( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QwtSeriesData<QPointF> *series, int from, int to ) const;
+
+    QPolygon toPoints( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QwtSeriesData<QPointF> *series, int from, int to ) const;
+
+    QPolygonF toPointsF( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QwtSeriesData<QPointF> *series, int from, int to ) const;
+
+    QImage toImage( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QwtSeriesData<QPointF> *series, int from, int to,
+        const QPen &, bool antialiased, uint numThreads ) const;
+
+private:
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPointMapper::TransformationFlags )
+
+#endif