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_compass_rose.h

@@ -0,0 +1,89 @@
+/* -*- 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_COMPASS_ROSE_H
+#define QWT_COMPASS_ROSE_H 1
+
+#include "qwt_global.h"
+#include <qpalette.h>
+
+class QPainter;
+
+/*!
+  \brief Abstract base class for a compass rose
+*/
+class QWT_EXPORT QwtCompassRose
+{
+public:
+    //! Destructor
+    virtual ~QwtCompassRose() {};
+
+    //! Assign a palette
+    virtual void setPalette( const QPalette &p )
+    {
+        d_palette = p;
+    }
+
+    //! \return Current palette
+    const QPalette &palette() const
+    {
+        return d_palette;
+    }
+
+    /*!
+        Draw the rose
+
+        \param painter Painter
+        \param center Center point
+        \param radius Radius of the rose
+        \param north Position
+        \param colorGroup Color group
+     */
+    virtual void draw( QPainter *painter,
+        const QPointF &center, double radius, double north,
+        QPalette::ColorGroup colorGroup = QPalette::Active ) const = 0;
+
+private:
+    QPalette d_palette;
+};
+
+/*!
+  \brief A simple rose for QwtCompass
+*/
+class QWT_EXPORT QwtSimpleCompassRose: public QwtCompassRose
+{
+public:
+    QwtSimpleCompassRose( int numThorns = 8, int numThornLevels = -1 );
+    virtual ~QwtSimpleCompassRose();
+
+    void setWidth( double );
+    double width() const;
+
+    void setNumThorns( int );
+    int numThorns() const;
+
+    void setNumThornLevels( int );
+    int numThornLevels() const;
+
+    void setShrinkFactor( double factor );
+    double shrinkFactor() const;
+
+    virtual void draw( QPainter *, const QPointF &center, double radius,
+        double north, QPalette::ColorGroup = QPalette::Active ) const;
+
+    static void drawRose( QPainter *, const QPalette &,
+        const QPointF &center, double radius, double north, double width,
+        int numThorns, int numThornLevels, double shrinkFactor );
+
+private:
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif