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.h

@@ -0,0 +1,83 @@
+/* -*- 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_H
+#define QWT_COMPASS_H 1
+
+#include "qwt_global.h"
+#include "qwt_dial.h"
+#include "qwt_round_scale_draw.h"
+#include <qstring.h>
+#include <qmap.h>
+
+class QwtCompassRose;
+
+/*!
+  \brief A special scale draw made for QwtCompass
+
+  QwtCompassScaleDraw maps values to strings using
+  a special map, that can be modified by the application
+
+  The default map consists of the labels N, NE, E, SE, S, SW, W, NW.
+
+  \sa QwtCompass
+*/
+class QWT_EXPORT QwtCompassScaleDraw: public QwtRoundScaleDraw
+{
+public:
+    explicit QwtCompassScaleDraw();
+    explicit QwtCompassScaleDraw( const QMap<double, QString> &map );
+
+    void setLabelMap( const QMap<double, QString> &map );
+    QMap<double, QString> labelMap() const;
+
+    virtual QwtText label( double value ) const;
+
+private:
+    QMap<double, QString> d_labelMap;
+};
+
+/*!
+  \brief A Compass Widget
+
+  QwtCompass is a widget to display and enter directions. It consists
+  of a scale, an optional needle and rose.
+
+  \image html dials1.png
+
+  \note The examples/dials example shows how to use QwtCompass.
+*/
+
+class QWT_EXPORT QwtCompass: public QwtDial
+{
+    Q_OBJECT
+
+public:
+    explicit QwtCompass( QWidget* parent = NULL );
+    virtual ~QwtCompass();
+
+    void setRose( QwtCompassRose *rose );
+    const QwtCompassRose *rose() const;
+    QwtCompassRose *rose();
+
+protected:
+    virtual void drawRose( QPainter *, const QPointF &center,
+        double radius, double north, QPalette::ColorGroup ) const;
+
+    virtual void drawScaleContents( QPainter *,
+        const QPointF &center, double radius ) const;
+
+    virtual void keyPressEvent( QKeyEvent * );
+
+private:
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif