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_symbol.h

@@ -0,0 +1,258 @@
+/* -*- 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_SYMBOL_H
+#define QWT_SYMBOL_H
+
+#include "qwt_global.h"
+#include <qpolygon.h>
+
+class QPainter;
+class QRect;
+class QSize;
+class QBrush;
+class QPen;
+class QColor;
+class QPointF;
+class QPolygonF;
+class QPainterPath;
+class QPixmap;
+class QByteArray;
+class QwtGraphic;
+
+//! A class for drawing symbols
+class QWT_EXPORT QwtSymbol
+{
+public:
+    /*!
+      Symbol Style
+      \sa setStyle(), style()
+     */
+    enum Style
+    {
+        //! No Style. The symbol cannot be drawn.
+        NoSymbol = -1,
+
+        //! Ellipse or circle
+        Ellipse,
+
+        //! Rectangle
+        Rect,
+
+        //!  Diamond
+        Diamond,
+
+        //! Triangle pointing upwards
+        Triangle,
+
+        //! Triangle pointing downwards
+        DTriangle,
+
+        //! Triangle pointing upwards
+        UTriangle,
+
+        //! Triangle pointing left
+        LTriangle,
+
+        //! Triangle pointing right
+        RTriangle,
+
+        //! Cross (+)
+        Cross,
+
+        //! Diagonal cross (X)
+        XCross,
+
+        //! Horizontal line
+        HLine,
+
+        //! Vertical line
+        VLine,
+
+        //! X combined with +
+        Star1,
+
+        //! Six-pointed star
+        Star2,
+
+        //! Hexagon
+        Hexagon,
+
+        /*!
+          The symbol is represented by a painter path, where the
+          origin ( 0, 0 ) of the path coordinate system is mapped to
+          the position of the symbol.
+
+          \sa setPath(), path()
+         */
+        Path,
+
+        /*!
+          The symbol is represented by a pixmap. The pixmap is centered
+          or aligned to its pin point.
+
+          \sa setPinPoint()
+         */
+        Pixmap,
+
+        /*!
+          The symbol is represented by a graphic. The graphic is centered
+          or aligned to its pin point.
+
+          \sa setPinPoint()
+         */
+        Graphic,
+
+        /*!
+          The symbol is represented by a SVG graphic. The graphic is centered
+          or aligned to its pin point.
+
+          \sa setPinPoint()
+         */
+        SvgDocument,
+
+        /*!
+         Styles >= QwtSymbol::UserSymbol are reserved for derived
+         classes of QwtSymbol that overload drawSymbols() with
+         additional application specific symbol types.
+         */
+        UserStyle = 1000
+    };
+
+    /*!
+      Depending on the render engine and the complexity of the
+      symbol shape it might be faster to render the symbol
+      to a pixmap and to paint this pixmap.
+
+      F.e. the raster paint engine is a pure software renderer
+      where in cache mode a draw operation usually ends in
+      raster operation with the the backing store, that are usually
+      faster, than the algorithms for rendering polygons.
+      But the opposite can be expected for graphic pipelines
+      that can make use of hardware acceleration.
+
+      The default setting is AutoCache
+
+      \sa setCachePolicy(), cachePolicy()
+
+      \note The policy has no effect, when the symbol is painted
+            to a vector graphics format ( PDF, SVG ).
+      \warning Since Qt 4.8 raster is the default backend on X11
+     */
+
+    enum CachePolicy
+    {
+        //! Don't use a pixmap cache
+        NoCache,
+
+        //! Always use a pixmap cache
+        Cache,
+
+        /*!
+           Use a cache when one of the following conditions is true:
+
+           - The symbol is rendered with the software
+             renderer ( QPaintEngine::Raster )
+         */
+        AutoCache
+    };
+
+public:
+    QwtSymbol( Style = NoSymbol );
+    QwtSymbol( Style, const QBrush &, const QPen &, const QSize & );
+    QwtSymbol( const QPainterPath &, const QBrush &, const QPen & );
+
+    virtual ~QwtSymbol();
+
+    void setCachePolicy( CachePolicy );
+    CachePolicy cachePolicy() const;
+
+    void setSize( const QSize & );
+    void setSize( int width, int height = -1 );
+    const QSize &size() const;
+
+    void setPinPoint( const QPointF &pos, bool enable = true );
+    QPointF pinPoint() const;
+
+    void setPinPointEnabled( bool );
+    bool isPinPointEnabled() const;
+
+    virtual void setColor( const QColor & );
+
+    void setBrush( const QBrush & );
+    const QBrush &brush() const;
+
+    void setPen( const QColor &, qreal width = 0.0, Qt::PenStyle = Qt::SolidLine );
+    void setPen( const QPen & );
+    const QPen &pen() const;
+
+    void setStyle( Style );
+    Style style() const;
+
+    void setPath( const QPainterPath & );
+    const QPainterPath &path() const;
+
+    void setPixmap( const QPixmap & );
+    const QPixmap &pixmap() const;
+
+    void setGraphic( const QwtGraphic & );
+    const QwtGraphic &graphic() const;
+
+#ifndef QWT_NO_SVG
+    void setSvgDocument( const QByteArray & );
+#endif
+
+    void drawSymbol( QPainter *, const QRectF & ) const;
+    void drawSymbol( QPainter *, const QPointF & ) const;
+    void drawSymbols( QPainter *, const QPolygonF & ) const;
+    void drawSymbols( QPainter *,
+        const QPointF *, int numPoints ) const;
+
+    virtual QRect boundingRect() const;
+    void invalidateCache();
+
+protected:
+    virtual void renderSymbols( QPainter *,
+        const QPointF *, int numPoints ) const;
+
+private:
+    // Disabled copy constructor and operator=
+    QwtSymbol( const QwtSymbol & );
+    QwtSymbol &operator=( const QwtSymbol & );
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+/*!
+  \brief Draw the symbol at a specified position
+
+  \param painter Painter
+  \param pos Position of the symbol in screen coordinates
+*/
+inline void QwtSymbol::drawSymbol(
+    QPainter *painter, const QPointF &pos ) const
+{
+    drawSymbols( painter, &pos, 1 );
+}
+
+/*!
+  \brief Draw symbols at the specified points
+
+  \param painter Painter
+  \param points Positions of the symbols in screen coordinates
+*/
+
+inline void QwtSymbol::drawSymbols(
+    QPainter *painter, const QPolygonF &points ) const
+{
+    drawSymbols( painter, points.data(), points.size() );
+}
+
+#endif