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/features/qwt.prf

@@ -0,0 +1,37 @@
+################################################################
+# 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
+################################################################
+
+include ( ./qwtconfig.pri )
+include ( ./qwtfunctions.pri )
+
+contains(QWT_CONFIG, QwtDll) {
+
+    DEFINES *= QWT_DLL
+}
+
+contains(QWT_CONFIG, QwtSvg) {
+
+	QT      *= svg
+}
+else {
+
+	DEFINES *= QWT_NO_SVG
+}
+
+contains(QWT_CONFIG, QwtFramework) {
+
+    INCLUDEPATH *= $${QWT_INSTALL_LIBS}/qwt.framework/Headers
+}
+else {
+
+    INCLUDEPATH *= $${QWT_INSTALL_HEADERS}
+}   
+
+# QMAKE_RPATHDIR *= $${QWT_INSTALL_LIBS}
+qwtAddLibrary($${QWT_INSTALL_LIBS}, qwt)