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_shapeitem.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_SHAPE_ITEM_H
+#define QWT_PLOT_SHAPE_ITEM_H
+
+#include "qwt_global.h"
+#include "qwt_plot_item.h"
+#include <qpainterpath.h>
+
+/*!
+  \brief A plot item, which displays any graphical shape,
+         that can be defined by a QPainterPath
+
+  A QPainterPath is a shape composed from intersecting and uniting
+  regions, rectangles, ellipses or irregular areas defined by lines, and curves.
+  QwtPlotShapeItem displays a shape with a pen and brush.
+
+  QwtPlotShapeItem offers a couple of optimizations like clipping or weeding.
+  These algorithms need to convert the painter path into polygons that might be
+  less performant for paths built from curves and ellipses.
+
+  \sa QwtPlotZone
+*/
+class QWT_EXPORT QwtPlotShapeItem: public QwtPlotItem
+{
+public:
+    /*!
+        Attributes to modify the drawing algorithm.
+        The default disables all attributes
+
+        \sa setPaintAttribute(), testPaintAttribute()
+    */
+    enum PaintAttribute
+    {
+        /*!
+          Clip polygons before painting them. In situations, where points
+          are far outside the visible area (f.e when zooming deep) this
+          might be a substantial improvement for the painting performance
+
+          But polygon clipping will convert the painter path into
+          polygons what might introduce a negative impact on the
+          performance of paths composed from curves or ellipses.
+         */
+        ClipPolygons = 0x01,
+    };
+
+    //! Paint attributes
+    typedef QFlags<PaintAttribute> PaintAttributes;
+
+    //! Mode how to display the item on the legend
+    enum LegendMode
+    {
+        //! Display a scaled down version of the shape
+        LegendShape,
+
+        //! Display a filled rectangle
+        LegendColor
+    };
+
+    explicit QwtPlotShapeItem( const QString &title = QString() );
+    explicit QwtPlotShapeItem( const QwtText &title );
+
+    virtual ~QwtPlotShapeItem();
+
+    void setPaintAttribute( PaintAttribute, bool on = true );
+    bool testPaintAttribute( PaintAttribute ) const;
+
+    void setLegendMode( LegendMode );
+    LegendMode legendMode() const;
+
+    void setRect( const QRectF & );
+    void setPolygon( const QPolygonF & );
+
+    void setShape( const QPainterPath & );
+    QPainterPath shape() const;
+
+    void setPen( const QColor &, qreal width = 0.0, Qt::PenStyle = Qt::SolidLine );
+    void setPen( const QPen & );
+    QPen pen() const;
+
+    void setBrush( const QBrush & );
+    QBrush brush() const;
+
+    void setRenderTolerance( double );
+    double renderTolerance() const;
+
+    virtual QRectF boundingRect() const;
+
+    virtual void draw( QPainter *,
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF &canvasRect ) const;
+
+    virtual QwtGraphic legendIcon( int index, const QSizeF & ) const;
+
+    virtual int rtti() const;
+
+private:
+    void init();
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif