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_text_engine.h

@@ -0,0 +1,172 @@
+/* -*- 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_TEXT_ENGINE_H
+#define QWT_TEXT_ENGINE_H 1
+
+#include "qwt_global.h"
+#include <qsize.h>
+
+class QFont;
+class QRectF;
+class QString;
+class QPainter;
+
+/*!
+  \brief Abstract base class for rendering text strings
+
+  A text engine is responsible for rendering texts for a
+  specific text format. They are used by QwtText to render a text.
+
+  QwtPlainTextEngine and QwtRichTextEngine are part of the Qwt library.
+  The implementation of QwtMathMLTextEngine uses code from the
+  Qt solution package. Because of license implications it is built into
+  a separate library.
+
+  \sa QwtText::setTextEngine()
+*/
+
+class QWT_EXPORT QwtTextEngine
+{
+public:
+    virtual ~QwtTextEngine();
+
+    /*!
+      Find the height for a given width
+
+      \param font Font of the text
+      \param flags Bitwise OR of the flags used like in QPainter::drawText
+      \param text Text to be rendered
+      \param width Width
+
+      \return Calculated height
+     */
+    virtual double heightForWidth( const QFont &font, int flags,
+        const QString &text, double width ) const = 0;
+
+    /*!
+      Returns the size, that is needed to render text
+
+      \param font Font of the text
+      \param flags Bitwise OR of the flags like in for QPainter::drawText
+      \param text Text to be rendered
+
+      \return Calculated size
+     */
+    virtual QSizeF textSize( const QFont &font, int flags,
+        const QString &text ) const = 0;
+
+    /*!
+      Test if a string can be rendered by this text engine
+
+      \param text Text to be tested
+      \return true, if it can be rendered
+     */
+    virtual bool mightRender( const QString &text ) const = 0;
+
+    /*!
+      Return margins around the texts
+
+      The textSize might include margins around the
+      text, like QFontMetrics::descent(). In situations
+      where texts need to be aligned in detail, knowing
+      these margins might improve the layout calculations.
+
+      \param font Font of the text
+      \param text Text to be rendered
+      \param left Return value for the left margin
+      \param right Return value for the right margin
+      \param top Return value for the top margin
+      \param bottom Return value for the bottom margin
+     */
+    virtual void textMargins( const QFont &font, const QString &text,
+        double &left, double &right, double &top, double &bottom ) const = 0;
+
+    /*!
+      Draw the text in a clipping rectangle
+
+      \param painter Painter
+      \param rect Clipping rectangle
+      \param flags Bitwise OR of the flags like in for QPainter::drawText()
+      \param text Text to be rendered
+     */
+    virtual void draw( QPainter *painter, const QRectF &rect,
+        int flags, const QString &text ) const = 0;
+
+protected:
+    QwtTextEngine();
+};
+
+
+/*!
+  \brief A text engine for plain texts
+
+  QwtPlainTextEngine renders texts using the basic Qt classes
+  QPainter and QFontMetrics.
+*/
+class QWT_EXPORT QwtPlainTextEngine: public QwtTextEngine
+{
+public:
+    QwtPlainTextEngine();
+    virtual ~QwtPlainTextEngine();
+
+    virtual double heightForWidth( const QFont &font, int flags,
+        const QString &text, double width ) const;
+
+    virtual QSizeF textSize( const QFont &font, int flags,
+        const QString &text ) const;
+
+    virtual void draw( QPainter *painter, const QRectF &rect,
+        int flags, const QString &text ) const;
+
+    virtual bool mightRender( const QString & ) const;
+
+    virtual void textMargins( const QFont &, const QString &,
+        double &left, double &right, double &top, double &bottom ) const;
+
+private:
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+
+#ifndef QT_NO_RICHTEXT
+
+/*!
+  \brief A text engine for Qt rich texts
+
+  QwtRichTextEngine renders Qt rich texts using the classes
+  of the Scribe framework of Qt.
+*/
+class QWT_EXPORT QwtRichTextEngine: public QwtTextEngine
+{
+public:
+    QwtRichTextEngine();
+
+    virtual double heightForWidth( const QFont &font, int flags,
+        const QString &text, double width ) const;
+
+    virtual QSizeF textSize( const QFont &font, int flags,
+        const QString &text ) const;
+
+    virtual void draw( QPainter *painter, const QRectF &rect,
+        int flags, const QString &text ) const;
+
+    virtual bool mightRender( const QString & ) const;
+
+    virtual void textMargins( const QFont &, const QString &,
+        double &left, double &right, double &top, double &bottom ) const;
+
+private:
+    QString taggedText( const QString &, int flags ) const;
+};
+
+#endif // !QT_NO_RICHTEXT
+
+#endif