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_spectrocurve.h

@@ -0,0 +1,79 @@
+/* -*- 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_CURVE_3D_H
+#define QWT_PLOT_CURVE_3D_H
+
+#include "qwt_global.h"
+#include "qwt_plot_seriesitem.h"
+#include "qwt_series_data.h"
+
+class QwtSymbol;
+class QwtColorMap;
+
+/*!
+    \brief Curve that displays 3D points as dots, where the z coordinate is
+           mapped to a color.
+*/
+class QWT_EXPORT QwtPlotSpectroCurve:
+    public QwtPlotSeriesItem, public QwtSeriesStore<QwtPoint3D>
+{
+public:
+    //! Paint attributes
+    enum PaintAttribute
+    {
+        //! Clip points outside the canvas rectangle
+        ClipPoints = 1
+    };
+
+    //! Paint attributes
+    typedef QFlags<PaintAttribute> PaintAttributes;
+
+    explicit QwtPlotSpectroCurve( const QString &title = QString() );
+    explicit QwtPlotSpectroCurve( const QwtText &title );
+
+    virtual ~QwtPlotSpectroCurve();
+
+    virtual int rtti() const;
+
+    void setPaintAttribute( PaintAttribute, bool on = true );
+    bool testPaintAttribute( PaintAttribute ) const;
+
+    void setSamples( const QVector<QwtPoint3D> & );
+    void setSamples( QwtSeriesData<QwtPoint3D> * );
+
+
+    void setColorMap( QwtColorMap * );
+    const QwtColorMap *colorMap() const;
+
+    void setColorRange( const QwtInterval & );
+    QwtInterval & colorRange() const;
+
+    virtual void drawSeries( QPainter *,
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF &canvasRect, int from, int to ) const;
+
+    void setPenWidth( double );
+    double penWidth() const;
+
+protected:
+    virtual void drawDots( QPainter *,
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF &canvasRect, int from, int to ) const;
+
+private:
+    void init();
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotSpectroCurve::PaintAttributes )
+
+#endif