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_pixel_matrix.h

@@ -0,0 +1,98 @@
+/* -*- 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_PIXEL_MATRIX_H
+#define QWT_PIXEL_MATRIX_H
+
+#include "qwt_global.h"
+#include <qbitarray.h>
+#include <qrect.h>
+
+/*!
+  \brief A bit field corresponding to the pixels of a rectangle
+
+  QwtPixelMatrix is intended to filter out duplicates in an
+  unsorted array of points.
+*/
+class QWT_EXPORT QwtPixelMatrix: public QBitArray
+{
+public:
+    QwtPixelMatrix( const QRect& rect );
+    ~QwtPixelMatrix();
+
+    void setRect( const QRect& rect );
+    QRect rect() const;
+
+    bool testPixel( int x, int y ) const;
+    bool testAndSetPixel( int x, int y, bool on );
+
+    int index( int x, int y ) const;
+
+private:
+    QRect d_rect;
+};
+
+/*!
+  \brief Test if a pixel has been set
+
+  \param x X-coordinate
+  \param y Y-coordinate
+
+  \return true, when pos is outside of rect(), or when the pixel
+          has already been set.
+ */
+inline bool QwtPixelMatrix::testPixel( int x, int y ) const
+{
+    const int idx = index( x, y );
+    return ( idx >= 0 ) ? testBit( idx ) : true;
+}
+
+/*!
+  \brief Set a pixel and test if a pixel has been set before
+
+  \param x X-coordinate
+  \param y Y-coordinate
+  \param on Set/Clear the pixel
+
+  \return true, when pos is outside of rect(), or when the pixel
+          was set before.
+ */
+inline bool QwtPixelMatrix::testAndSetPixel( int x, int y, bool on )
+{
+    const int idx = index( x, y );
+    if ( idx < 0 )
+        return true;
+
+    const bool onBefore = testBit( idx );
+    setBit( idx, on );
+
+    return onBefore;
+}
+
+/*!
+  \brief Calculate the index in the bit field corresponding to a position
+
+  \param x X-coordinate
+  \param y Y-coordinate
+  \return Index, when rect() contains pos - otherwise -1.
+ */
+inline int QwtPixelMatrix::index( int x, int y ) const
+{
+    const int dx = x - d_rect.x();
+    if ( dx < 0 || dx >= d_rect.width() )
+        return -1;
+
+    const int dy = y - d_rect.y();
+    if ( dy < 0 || dy >= d_rect.height() )
+        return -1;
+
+    return dy * d_rect.width() + dx;
+}
+
+#endif