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_scale_widget.h

@@ -0,0 +1,136 @@
+/* -*- 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_SCALE_WIDGET_H
+#define QWT_SCALE_WIDGET_H
+
+#include "qwt_global.h"
+#include "qwt_text.h"
+#include "qwt_scale_draw.h"
+#include <qwidget.h>
+#include <qfont.h>
+#include <qcolor.h>
+#include <qstring.h>
+
+class QPainter;
+class QwtTransform;
+class QwtScaleDiv;
+class QwtColorMap;
+
+/*!
+  \brief A Widget which contains a scale
+
+  This Widget can be used to decorate composite widgets with
+  a scale.
+*/
+
+class QWT_EXPORT QwtScaleWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    //! Layout flags of the title
+    enum LayoutFlag
+    {
+        /*!
+          The title of vertical scales is painted from top to bottom.
+          Otherwise it is painted from bottom to top.
+         */
+        TitleInverted = 1
+    };
+
+    //! Layout flags of the title
+    typedef QFlags<LayoutFlag> LayoutFlags;
+
+    explicit QwtScaleWidget( QWidget *parent = NULL );
+    explicit QwtScaleWidget( QwtScaleDraw::Alignment, QWidget *parent = NULL );
+    virtual ~QwtScaleWidget();
+
+Q_SIGNALS:
+    //! Signal emitted, whenever the scale division changes
+    void scaleDivChanged();
+
+public:
+    void setTitle( const QString &title );
+    void setTitle( const QwtText &title );
+    QwtText title() const;
+
+    void setLayoutFlag( LayoutFlag, bool on );
+    bool testLayoutFlag( LayoutFlag ) const;
+
+    void setBorderDist( int dist1, int dist2 );
+    int startBorderDist() const;
+    int endBorderDist() const;
+
+    void getBorderDistHint( int &start, int &end ) const;
+
+    void getMinBorderDist( int &start, int &end ) const;
+    void setMinBorderDist( int start, int end );
+
+    void setMargin( int );
+    int margin() const;
+
+    void setSpacing( int );
+    int spacing() const;
+
+    void setScaleDiv( const QwtScaleDiv & );
+    void setTransformation( QwtTransform * );
+
+    void setScaleDraw( QwtScaleDraw * );
+    const QwtScaleDraw *scaleDraw() const;
+    QwtScaleDraw *scaleDraw();
+
+    void setLabelAlignment( Qt::Alignment );
+    void setLabelRotation( double rotation );
+
+    void setColorBarEnabled( bool );
+    bool isColorBarEnabled() const;
+
+    void setColorBarWidth( int );
+    int colorBarWidth() const;
+
+    void setColorMap( const QwtInterval &, QwtColorMap * );
+
+    QwtInterval colorBarInterval() const;
+    const QwtColorMap *colorMap() const;
+
+    virtual QSize sizeHint() const;
+    virtual QSize minimumSizeHint() const;
+
+    int titleHeightForWidth( int width ) const;
+    int dimForLength( int length, const QFont &scaleFont ) const;
+
+    void drawColorBar( QPainter *painter, const QRectF & ) const;
+    void drawTitle( QPainter *painter, QwtScaleDraw::Alignment,
+        const QRectF &rect ) const;
+
+    void setAlignment( QwtScaleDraw::Alignment );
+    QwtScaleDraw::Alignment alignment() const;
+
+    QRectF colorBarRect( const QRectF& ) const;
+
+protected:
+    virtual void paintEvent( QPaintEvent * );
+    virtual void resizeEvent( QResizeEvent * );
+
+    void draw( QPainter * ) const;
+
+    void scaleChange();
+    void layoutScale( bool update_geometry = true );
+
+private:
+    void initScale( QwtScaleDraw::Alignment );
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS( QwtScaleWidget::LayoutFlags )
+
+#endif