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_directpainter.h

@@ -0,0 +1,100 @@
+/* -*- 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_DIRECT_PAINTER_H
+#define QWT_PLOT_DIRECT_PAINTER_H
+
+#include "qwt_global.h"
+#include <qobject.h>
+
+class QRegion;
+class QwtPlotSeriesItem;
+
+/*!
+    \brief Painter object trying to paint incrementally
+
+    Often applications want to display samples while they are
+    collected. When there are too many samples complete replots
+    will be expensive to be processed in a collection cycle.
+
+    QwtPlotDirectPainter offers an API to paint
+    subsets ( f.e all additions points ) without erasing/repainting
+    the plot canvas.
+
+    On certain environments it might be important to calculate a proper
+    clip region before painting. F.e. for Qt Embedded only the clipped part
+    of the backing store will be copied to a ( maybe unaccelerated )
+    frame buffer.
+
+    \warning Incremental painting will only help when no replot is triggered
+             by another operation ( like changing scales ) and nothing needs
+             to be erased.
+*/
+class QWT_EXPORT QwtPlotDirectPainter: public QObject
+{
+public:
+    /*!
+      \brief Paint attributes
+      \sa setAttribute(), testAttribute(), drawSeries()
+    */
+    enum Attribute
+    {
+        /*!
+          Initializing a QPainter is an expensive operation.
+          When AtomicPainter is set each call of drawSeries() opens/closes
+          a temporary QPainter. Otherwise QwtPlotDirectPainter tries to
+          use the same QPainter as long as possible.
+         */
+        AtomicPainter = 0x01,
+
+        /*!
+          When FullRepaint is set the plot canvas is explicitly repainted
+          after the samples have been rendered.
+         */
+        FullRepaint = 0x02,
+
+        /*!
+          When QwtPlotCanvas::BackingStore is enabled the painter
+          has to paint to the backing store and the widget. In certain
+          situations/environments it might be faster to paint to
+          the backing store only and then copy the backing store to the canvas.
+          This flag can also be useful for settings, where Qt fills the
+          the clip region with the widget background.
+         */
+        CopyBackingStore = 0x04
+    };
+
+    //! Paint attributes
+    typedef QFlags<Attribute> Attributes;
+
+    QwtPlotDirectPainter( QObject *parent = NULL );
+    virtual ~QwtPlotDirectPainter();
+
+    void setAttribute( Attribute, bool on );
+    bool testAttribute( Attribute ) const;
+
+    void setClipping( bool );
+    bool hasClipping() const;
+
+    void setClipRegion( const QRegion & );
+    QRegion clipRegion() const;
+
+    void drawSeries( QwtPlotSeriesItem *, int from, int to );
+    void reset();
+
+    virtual bool eventFilter( QObject *, QEvent * );
+
+private:
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS( QwtPlotDirectPainter::Attributes )
+
+#endif