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_canvas.h

@@ -0,0 +1,171 @@
+/* -*- 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_CANVAS_H
+#define QWT_PLOT_CANVAS_H
+
+#include "qwt_global.h"
+#include <qframe.h>
+#include <qpainterpath.h>
+
+class QwtPlot;
+class QPixmap;
+
+/*!
+  \brief Canvas of a QwtPlot.
+
+   Canvas is the widget where all plot items are displayed
+
+  \sa QwtPlot::setCanvas(), QwtPlotGLCanvas
+*/
+class QWT_EXPORT QwtPlotCanvas : public QFrame
+{
+    Q_OBJECT
+
+    Q_PROPERTY( double borderRadius READ borderRadius WRITE setBorderRadius )
+
+public:
+
+    /*!
+      \brief Paint attributes
+
+      The default setting enables BackingStore and Opaque.
+
+      \sa setPaintAttribute(), testPaintAttribute()
+     */
+    enum PaintAttribute
+    {
+        /*!
+          \brief Paint double buffered reusing the content
+                 of the pixmap buffer when possible.
+
+          Using a backing store might improve the performance
+          significantly, when working with widget overlays ( like rubber bands ).
+          Disabling the cache might improve the performance for
+          incremental paints (using QwtPlotDirectPainter ).
+
+          \sa backingStore(), invalidateBackingStore()
+         */
+        BackingStore = 1,
+
+        /*!
+          \brief Try to fill the complete contents rectangle
+                 of the plot canvas
+
+          When using styled backgrounds Qt assumes, that the
+          canvas doesn't fill its area completely
+          ( f.e because of rounded borders ) and fills the area
+          below the canvas. When this is done with gradients it might
+          result in a serious performance bottleneck - depending on the size.
+
+          When the Opaque attribute is enabled the canvas tries to
+          identify the gaps with some heuristics and to fill those only.
+
+          \warning Will not work for semitransparent backgrounds
+         */
+        Opaque       = 2,
+
+        /*!
+          \brief Try to improve painting of styled backgrounds
+
+          QwtPlotCanvas supports the box model attributes for
+          customizing the layout with style sheets. Unfortunately
+          the design of Qt style sheets has no concept how to
+          handle backgrounds with rounded corners - beside of padding.
+
+          When HackStyledBackground is enabled the plot canvas tries
+          to separate the background from the background border
+          by reverse engineering to paint the background before and
+          the border after the plot items. In this order the border
+          gets perfectly antialiased and you can avoid some pixel
+          artifacts in the corners.
+         */
+        HackStyledBackground = 4,
+
+        /*!
+          When ImmediatePaint is set replot() calls repaint()
+          instead of update().
+
+          \sa replot(), QWidget::repaint(), QWidget::update()
+         */
+        ImmediatePaint = 8
+    };
+
+    //! Paint attributes
+    typedef QFlags<PaintAttribute> PaintAttributes;
+
+    /*!
+      \brief Focus indicator
+      The default setting is NoFocusIndicator
+      \sa setFocusIndicator(), focusIndicator(), drawFocusIndicator()
+    */
+
+    enum FocusIndicator
+    {
+        //! Don't paint a focus indicator
+        NoFocusIndicator,
+
+        /*!
+          The focus is related to the complete canvas.
+          Paint the focus indicator using drawFocusIndicator()
+         */
+        CanvasFocusIndicator,
+
+        /*!
+          The focus is related to an item (curve, point, ...) on
+          the canvas. It is up to the application to display a
+          focus indication using f.e. highlighting.
+         */
+        ItemFocusIndicator
+    };
+
+    explicit QwtPlotCanvas( QwtPlot * = NULL );
+    virtual ~QwtPlotCanvas();
+
+    QwtPlot *plot();
+    const QwtPlot *plot() const;
+
+    void setFocusIndicator( FocusIndicator );
+    FocusIndicator focusIndicator() const;
+
+    void setBorderRadius( double );
+    double borderRadius() const;
+
+    void setPaintAttribute( PaintAttribute, bool on = true );
+    bool testPaintAttribute( PaintAttribute ) const;
+
+    const QPixmap *backingStore() const;
+    void invalidateBackingStore();
+
+    virtual bool event( QEvent * );
+
+    Q_INVOKABLE QPainterPath borderPath( const QRect & ) const;
+
+public Q_SLOTS:
+    void replot();
+
+protected:
+    virtual void paintEvent( QPaintEvent * );
+    virtual void resizeEvent( QResizeEvent * );
+
+    virtual void drawFocusIndicator( QPainter * );
+    virtual void drawBorder( QPainter * );
+
+    void updateStyleSheetInfo();
+
+private:
+    void drawCanvas( QPainter *, bool withBackground );
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotCanvas::PaintAttributes )
+
+#endif