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_painter_command.h

@@ -0,0 +1,174 @@
+/* -*- 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_PAINTER_COMMAND_H
+#define QWT_PAINTER_COMMAND_H
+
+#include "qwt_global.h"
+#include <qpaintengine.h>
+#include <qpixmap.h>
+#include <qimage.h>
+#include <qpolygon.h>
+#include <qpainterpath.h>
+
+class QPainterPath;
+
+/*!
+  QwtPainterCommand represents the attributes of a paint operation
+  how it is used between QPainter and QPaintDevice
+
+  It is used by QwtGraphic to record and replay paint operations
+
+  \sa QwtGraphic::commands()
+ */
+
+class QWT_EXPORT QwtPainterCommand
+{
+public:
+    //! Type of the paint command
+    enum Type
+    {
+        //! Invalid command
+        Invalid = -1,
+
+        //! Draw a QPainterPath
+        Path,
+
+        //! Draw a QPixmap
+        Pixmap,
+
+        //! Draw a QImage
+        Image,
+
+        //! QPainter state change
+        State
+    };
+
+    //! Attributes how to paint a QPixmap
+    struct PixmapData
+    {
+        QRectF rect;
+        QPixmap pixmap;
+        QRectF subRect;
+    };
+
+    //! Attributes how to paint a QImage
+    struct ImageData
+    {
+        QRectF rect;
+        QImage image;
+        QRectF subRect;
+        Qt::ImageConversionFlags flags;
+    };
+
+    //! Attributes of a state change
+    struct StateData
+    {
+        QPaintEngine::DirtyFlags flags;
+
+        QPen pen;
+        QBrush brush;
+        QPointF brushOrigin;
+        QBrush backgroundBrush;
+        Qt::BGMode backgroundMode;
+        QFont font;
+        QMatrix matrix;
+        QTransform transform;
+
+        Qt::ClipOperation clipOperation;
+        QRegion clipRegion;
+        QPainterPath clipPath;
+        bool isClipEnabled;
+
+        QPainter::RenderHints renderHints;
+        QPainter::CompositionMode compositionMode;
+        qreal opacity;
+    };
+
+    QwtPainterCommand();
+    QwtPainterCommand(const QwtPainterCommand &);
+
+    QwtPainterCommand( const QPainterPath & );
+
+    QwtPainterCommand( const QRectF &rect,
+            const QPixmap &, const QRectF& subRect );
+
+    QwtPainterCommand( const QRectF &rect,
+            const QImage &, const QRectF& subRect,
+            Qt::ImageConversionFlags );
+
+    QwtPainterCommand( const QPaintEngineState & );
+
+    ~QwtPainterCommand();
+
+    QwtPainterCommand &operator=(const QwtPainterCommand & );
+
+    Type type() const;
+
+    QPainterPath *path();
+    const QPainterPath *path() const;
+
+    PixmapData* pixmapData();
+    const PixmapData* pixmapData() const;
+
+    ImageData* imageData();
+    const ImageData* imageData() const;
+
+    StateData* stateData();
+    const StateData* stateData() const;
+
+private:
+    void copy( const QwtPainterCommand & );
+    void reset();
+
+    Type d_type;
+
+    union
+    {
+        QPainterPath *d_path;
+        PixmapData *d_pixmapData;
+        ImageData *d_imageData;
+        StateData *d_stateData;
+    };
+};
+
+//! \return Type of the command
+inline QwtPainterCommand::Type QwtPainterCommand::type() const
+{
+    return d_type;
+}
+
+//! \return Painter path to be painted
+inline const QPainterPath *QwtPainterCommand::path() const
+{
+    return d_path;
+}
+
+//! \return Attributes how to paint a QPixmap
+inline const QwtPainterCommand::PixmapData *
+QwtPainterCommand::pixmapData() const
+{
+    return d_pixmapData;
+}
+
+//! \return Attributes how to paint a QImage
+inline const QwtPainterCommand::ImageData *
+QwtPainterCommand::imageData() const
+{
+    return d_imageData;
+}
+
+//! \return Attributes of a state change
+inline const QwtPainterCommand::StateData *
+QwtPainterCommand::stateData() const
+{
+    return d_stateData;
+}
+
+#endif