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_spectrogram.h

@@ -0,0 +1,118 @@
+/* -*- 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_SPECTROGRAM_H
+#define QWT_PLOT_SPECTROGRAM_H
+
+#include "qwt_global.h"
+#include "qwt_raster_data.h"
+#include "qwt_plot_rasteritem.h"
+#include <qlist.h>
+
+class QwtColorMap;
+
+/*!
+  \brief A plot item, which displays a spectrogram
+
+  A spectrogram displays 3-dimensional data, where the 3rd dimension
+  ( the intensity ) is displayed using colors. The colors are calculated
+  from the values using a color map.
+
+  On multi-core systems the performance of the image composition
+  can often be improved by dividing the area into tiles - each of them
+  rendered in a different thread ( see QwtPlotItem::setRenderThreadCount() ).
+
+  In ContourMode contour lines are painted for the contour levels.
+
+  \image html spectrogram3.png
+
+  \sa QwtRasterData, QwtColorMap, QwtPlotItem::setRenderThreadCount()
+*/
+
+class QWT_EXPORT QwtPlotSpectrogram: public QwtPlotRasterItem
+{
+public:
+    /*!
+      The display mode controls how the raster data will be represented.
+      \sa setDisplayMode(), testDisplayMode()
+    */
+
+    enum DisplayMode
+    {
+        //! The values are mapped to colors using a color map.
+        ImageMode = 0x01,
+
+        //! The data is displayed using contour lines
+        ContourMode = 0x02
+    };
+
+    //! Display modes
+    typedef QFlags<DisplayMode> DisplayModes;
+
+    explicit QwtPlotSpectrogram( const QString &title = QString() );
+    virtual ~QwtPlotSpectrogram();
+
+    void setDisplayMode( DisplayMode, bool on = true );
+    bool testDisplayMode( DisplayMode ) const;
+
+    void setData( QwtRasterData *data );
+    const QwtRasterData *data() const;
+    QwtRasterData *data();
+
+    void setColorMap( QwtColorMap * );
+    const QwtColorMap *colorMap() const;
+
+    virtual QwtInterval interval(Qt::Axis) const;
+    virtual QRectF pixelHint( const QRectF & ) const;
+
+    void setDefaultContourPen( const QColor &,
+        qreal width = 0.0, Qt::PenStyle = Qt::SolidLine );
+    void setDefaultContourPen( const QPen & );
+    QPen defaultContourPen() const;
+
+    virtual QPen contourPen( double level ) const;
+
+    void setConrecFlag( QwtRasterData::ConrecFlag, bool on );
+    bool testConrecFlag( QwtRasterData::ConrecFlag ) const;
+
+    void setContourLevels( const QList<double> & );
+    QList<double> contourLevels() const;
+
+    virtual int rtti() const;
+
+    virtual void draw( QPainter *,
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF &canvasRect ) const;
+
+protected:
+    virtual QImage renderImage(
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRectF &area, const QSize &imageSize ) const;
+
+    virtual QSize contourRasterSize(
+        const QRectF &, const QRect & ) const;
+
+    virtual QwtRasterData::ContourLines renderContourLines(
+        const QRectF &rect, const QSize &raster ) const;
+
+    virtual void drawContourLines( QPainter *,
+        const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QwtRasterData::ContourLines& ) const;
+
+    void renderTile( const QwtScaleMap &xMap, const QwtScaleMap &yMap,
+        const QRect &tile, QImage * ) const;
+
+private:
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotSpectrogram::DisplayModes )
+
+#endif