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_global.h

@@ -0,0 +1,41 @@
+/* -*- 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_GLOBAL_H
+#define QWT_GLOBAL_H
+
+#include <qglobal.h>
+
+// QWT_VERSION is (major << 16) + (minor << 8) + patch.
+
+#define QWT_VERSION       0x060105
+#define QWT_VERSION_STR   "6.1.5"
+
+#if defined(_MSC_VER) /* MSVC Compiler */
+/* template-class specialization 'identifier' is already instantiated */
+#pragma warning(disable: 4660)
+/* inherits via dominance */
+#pragma warning(disable: 4250)
+#endif // _MSC_VER
+
+#ifdef QWT_DLL
+
+#if defined(QWT_MAKEDLL)     // create a Qwt DLL library
+#define QWT_EXPORT Q_DECL_EXPORT
+#else                        // use a Qwt DLL library
+#define QWT_EXPORT Q_DECL_IMPORT
+#endif
+
+#endif // QWT_DLL
+
+#ifndef QWT_EXPORT
+#define QWT_EXPORT
+#endif
+
+#endif