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_plot_zoomer.h

@@ -0,0 +1,140 @@
+/* -*- 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_PLOT_ZOOMER_H
+#define QWT_PLOT_ZOOMER_H
+
+#include "qwt_global.h"
+#include "qwt_plot_picker.h"
+#include <qstack.h>
+
+/*!
+  \brief QwtPlotZoomer provides stacked zooming for a plot widget
+
+  QwtPlotZoomer selects rectangles from user inputs ( mouse or keyboard )
+  translates them into plot coordinates and adjusts the axes to them.
+  The selection is supported by a rubber band and optionally by displaying
+  the coordinates of the current mouse position.
+
+  Zooming can be repeated as often as possible, limited only by
+  maxStackDepth() or minZoomSize().  Each rectangle is pushed on a stack.
+
+  The default setting how to select rectangles is
+  a QwtPickerDragRectMachine with the following bindings:
+
+  - QwtEventPattern::MouseSelect1\n
+    The first point of the zoom rectangle is selected by a mouse press,
+    the second point from the position, where the mouse is released.
+
+  - QwtEventPattern::KeySelect1\n
+    The first key press selects the first, the second key press
+    selects the second point.
+
+  - QwtEventPattern::KeyAbort\n
+    Discard the selection in the state, where the first point
+    is selected.
+
+  To traverse the zoom stack the following bindings are used:
+
+  - QwtEventPattern::MouseSelect3, QwtEventPattern::KeyUndo\n
+    Zoom out one position on the zoom stack
+
+  - QwtEventPattern::MouseSelect6, QwtEventPattern::KeyRedo\n
+    Zoom in one position on the zoom stack
+
+  - QwtEventPattern::MouseSelect2, QwtEventPattern::KeyHome\n
+    Zoom to the zoom base
+
+  The setKeyPattern() and setMousePattern() functions can be used
+  to configure the zoomer actions. The following example
+  shows, how to configure the 'I' and 'O' keys for zooming in and out
+  one position on the zoom stack. The "Home" key is used to
+  "unzoom" the plot.
+
+  \code
+   zoomer = new QwtPlotZoomer( plot );
+   zoomer->setKeyPattern( QwtEventPattern::KeyRedo, Qt::Key_I, Qt::ShiftModifier );
+   zoomer->setKeyPattern( QwtEventPattern::KeyUndo, Qt::Key_O, Qt::ShiftModifier );
+   zoomer->setKeyPattern( QwtEventPattern::KeyHome, Qt::Key_Home );
+  \endcode
+
+  QwtPlotZoomer is tailored for plots with one x and y axis, but it is
+  allowed to attach a second QwtPlotZoomer ( without rubber band and tracker )
+  for the other axes.
+
+  \note The realtime example includes an derived zoomer class that adds
+        scrollbars to the plot canvas.
+
+  \sa QwtPlotPanner, QwtPlotMagnifier
+*/
+
+class QWT_EXPORT QwtPlotZoomer: public QwtPlotPicker
+{
+    Q_OBJECT
+public:
+    explicit QwtPlotZoomer( QWidget *, bool doReplot = true );
+    explicit QwtPlotZoomer( int xAxis, int yAxis,
+                            QWidget *, bool doReplot = true );
+
+    virtual ~QwtPlotZoomer();
+
+    virtual void setZoomBase( bool doReplot = true );
+    virtual void setZoomBase( const QRectF & );
+
+    QRectF zoomBase() const;
+    QRectF zoomRect() const;
+
+    virtual void setAxis( int xAxis, int yAxis );
+
+    void setMaxStackDepth( int );
+    int maxStackDepth() const;
+
+    const QStack<QRectF> &zoomStack() const;
+    void setZoomStack( const QStack<QRectF> &,
+        int zoomRectIndex = -1 );
+
+    uint zoomRectIndex() const;
+
+public Q_SLOTS:
+    void moveBy( double dx, double dy );
+    virtual void moveTo( const QPointF & );
+
+    virtual void zoom( const QRectF & );
+    virtual void zoom( int offset );
+
+Q_SIGNALS:
+    /*!
+      A signal emitting the zoomRect(), when the plot has been
+      zoomed in or out.
+
+      \param rect Current zoom rectangle.
+    */
+
+    void zoomed( const QRectF &rect );
+
+protected:
+    virtual void rescale();
+
+    virtual QSizeF minZoomSize() const;
+
+    virtual void widgetMouseReleaseEvent( QMouseEvent * );
+    virtual void widgetKeyPressEvent( QKeyEvent * );
+
+    virtual void begin();
+    virtual bool end( bool ok = true );
+    virtual bool accept( QPolygon & ) const;
+
+private:
+    void init( bool doReplot );
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif