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_draw.h

@@ -0,0 +1,120 @@
+/* -*- 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_DRAW_H
+#define QWT_SCALE_DRAW_H
+
+#include "qwt_global.h"
+#include "qwt_abstract_scale_draw.h"
+#include <qpoint.h>
+#include <qrect.h>
+#include <qtransform.h>
+
+/*!
+  \brief A class for drawing scales
+
+  QwtScaleDraw can be used to draw linear or logarithmic scales.
+  A scale has a position, an alignment and a length, which can be specified .
+  The labels can be rotated and aligned
+  to the ticks using setLabelRotation() and setLabelAlignment().
+
+  After a scale division has been specified as a QwtScaleDiv object
+  using QwtAbstractScaleDraw::setScaleDiv(const QwtScaleDiv &s),
+  the scale can be drawn with the QwtAbstractScaleDraw::draw() member.
+*/
+class QWT_EXPORT QwtScaleDraw: public QwtAbstractScaleDraw
+{
+public:
+    /*!
+        Alignment of the scale draw
+        \sa setAlignment(), alignment()
+     */
+    enum Alignment
+    {
+        //! The scale is below
+        BottomScale,
+
+        //! The scale is above
+        TopScale,
+
+        //! The scale is left
+        LeftScale,
+
+        //! The scale is right
+        RightScale
+    };
+
+    QwtScaleDraw();
+    virtual ~QwtScaleDraw();
+
+    void getBorderDistHint( const QFont &, int &start, int &end ) const;
+    int minLabelDist( const QFont & ) const;
+
+    int minLength( const QFont & ) const;
+    virtual double extent( const QFont & ) const;
+
+    void move( double x, double y );
+    void move( const QPointF & );
+    void setLength( double length );
+
+    Alignment alignment() const;
+    void setAlignment( Alignment );
+
+    Qt::Orientation orientation() const;
+
+    QPointF pos() const;
+    double length() const;
+
+    void setLabelAlignment( Qt::Alignment );
+    Qt::Alignment labelAlignment() const;
+
+    void setLabelRotation( double rotation );
+    double labelRotation() const;
+
+    int maxLabelHeight( const QFont & ) const;
+    int maxLabelWidth( const QFont & ) const;
+
+    QPointF labelPosition( double value ) const;
+
+    QRectF labelRect( const QFont &, double value ) const;
+    QSizeF labelSize( const QFont &, double value ) const;
+
+    QRect boundingLabelRect( const QFont &, double value ) const;
+
+protected:
+    QTransform labelTransformation( const QPointF &, const QSizeF & ) const;
+
+    virtual void drawTick( QPainter *, double value, double len ) const;
+    virtual void drawBackbone( QPainter * ) const;
+    virtual void drawLabel( QPainter *, double value ) const;
+
+private:
+    QwtScaleDraw( const QwtScaleDraw & );
+    QwtScaleDraw &operator=( const QwtScaleDraw &other );
+
+    void updateMap();
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+/*!
+   Move the position of the scale
+
+   \param x X coordinate
+   \param y Y coordinate
+
+   \sa move(const QPointF &)
+*/
+inline void QwtScaleDraw::move( double x, double y )
+{
+    move( QPointF( x, y ) );
+}
+
+#endif