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_counter.h

@@ -0,0 +1,161 @@
+/* -*- 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_COUNTER_H
+#define QWT_COUNTER_H
+
+#include "qwt_global.h"
+#include <qwidget.h>
+
+/*!
+  \brief The Counter Widget
+
+  A Counter consists of a label displaying a number and
+  one ore more (up to three) push buttons on each side
+  of the label which can be used to increment or decrement
+  the counter's value.
+
+  A counter has a range from a minimum value to a maximum value
+  and a step size. When the wrapping property is set
+  the counter is circular.
+
+  The number of steps by which a button increments or decrements the value
+  can be specified using setIncSteps(). The number of buttons can be
+  changed with setNumButtons().
+
+  Example:
+\code
+#include <qwt_counter.h>
+
+QwtCounter *counter = new QwtCounter(parent);
+
+counter->setRange(0.0, 100.0);                  // From 0.0 to 100
+counter->setSingleStep( 1.0 );                  // Step size 1.0
+counter->setNumButtons(2);                      // Two buttons each side
+counter->setIncSteps(QwtCounter::Button1, 1);   // Button 1 increments 1 step
+counter->setIncSteps(QwtCounter::Button2, 20);  // Button 2 increments 20 steps
+
+connect(counter, SIGNAL(valueChanged(double)), myClass, SLOT(newValue(double)));
+\endcode
+ */
+
+class QWT_EXPORT QwtCounter : public QWidget
+{
+    Q_OBJECT
+
+    Q_PROPERTY( double value READ value WRITE setValue )
+    Q_PROPERTY( double minimum READ minimum WRITE setMinimum )
+    Q_PROPERTY( double maximum READ maximum WRITE setMaximum )
+    Q_PROPERTY( double singleStep READ singleStep WRITE setSingleStep )
+
+    Q_PROPERTY( int numButtons READ numButtons WRITE setNumButtons )
+    Q_PROPERTY( int stepButton1 READ stepButton1 WRITE setStepButton1 )
+    Q_PROPERTY( int stepButton2 READ stepButton2 WRITE setStepButton2 )
+    Q_PROPERTY( int stepButton3 READ stepButton3 WRITE setStepButton3 )
+
+    Q_PROPERTY( bool readOnly READ isReadOnly WRITE setReadOnly )
+    Q_PROPERTY( bool wrapping READ wrapping WRITE setWrapping )
+
+public:
+    //! Button index
+    enum Button
+    {
+        //! Button intended for minor steps
+        Button1,
+
+        //! Button intended for medium steps
+        Button2,
+
+        //! Button intended for large steps
+        Button3,
+
+        //! Number of buttons
+        ButtonCnt
+    };
+
+    explicit QwtCounter( QWidget *parent = NULL );
+    virtual ~QwtCounter();
+
+    void setValid( bool );
+    bool isValid() const;
+
+    void setWrapping( bool );
+    bool wrapping() const;
+
+    bool isReadOnly() const;
+    void setReadOnly( bool );
+
+    void setNumButtons( int );
+    int numButtons() const;
+
+    void setIncSteps( QwtCounter::Button, int numSteps );
+    int incSteps( QwtCounter::Button ) const;
+
+    virtual QSize sizeHint() const;
+
+    double singleStep() const;
+    void setSingleStep( double stepSize );
+
+    void setRange( double min, double max );
+
+    double minimum() const;
+    void setMinimum( double );
+
+    double maximum() const;
+    void setMaximum( double );
+
+    void setStepButton1( int nSteps );
+    int stepButton1() const;
+
+    void setStepButton2( int nSteps );
+    int stepButton2() const;
+
+    void setStepButton3( int nSteps );
+    int stepButton3() const;
+
+    double value() const;
+
+public Q_SLOTS:
+    void setValue( double );
+
+
+Q_SIGNALS:
+    /*!
+        This signal is emitted when a button has been released
+        \param value The new value
+    */
+    void buttonReleased ( double value );
+
+    /*!
+        This signal is emitted when the counter's value has changed
+        \param value The new value
+    */
+    void valueChanged ( double value );
+
+protected:
+    virtual bool event( QEvent * );
+    virtual void wheelEvent( QWheelEvent * );
+    virtual void keyPressEvent( QKeyEvent * );
+
+private Q_SLOTS:
+    void btnReleased();
+    void btnClicked();
+    void textChanged();
+
+private:
+    void incrementValue( int numSteps );
+    void initCounter();
+    void updateButtons();
+    void showNumber( double );
+
+    class PrivateData;
+    PrivateData *d_data;
+};
+
+#endif