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/doc/man/man3/QwtTextEngine.3

@@ -0,0 +1,162 @@
+.TH "QwtTextEngine" 3 "Mon Jun 1 2020" "Version 6.1.5" "Qwt User's Guide" \" -*- nroff -*-
+.ad l
+.nh
+.SH NAME
+QwtTextEngine \- Abstract base class for rendering text strings\&.  
+
+.SH SYNOPSIS
+.br
+.PP
+.PP
+\fC#include <qwt_text_engine\&.h>\fP
+.PP
+Inherited by \fBQwtMathMLTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtRichTextEngine\fP\&.
+.SS "Public Member Functions"
+
+.in +1c
+.ti -1c
+.RI "virtual \fB~QwtTextEngine\fP ()"
+.br
+.RI "Destructor\&. "
+.ti -1c
+.RI "virtual double \fBheightForWidth\fP (const QFont &font, int flags, const QString &text, double width) const =0"
+.br
+.ti -1c
+.RI "virtual QSizeF \fBtextSize\fP (const QFont &font, int flags, const QString &text) const =0"
+.br
+.ti -1c
+.RI "virtual bool \fBmightRender\fP (const QString &text) const =0"
+.br
+.ti -1c
+.RI "virtual void \fBtextMargins\fP (const QFont &font, const QString &text, double &left, double &right, double &top, double &bottom) const =0"
+.br
+.ti -1c
+.RI "virtual void \fBdraw\fP (QPainter *painter, const QRectF &rect, int flags, const QString &text) const =0"
+.br
+.in -1c
+.SS "Protected Member Functions"
+
+.in +1c
+.ti -1c
+.RI "\fBQwtTextEngine\fP ()"
+.br
+.RI "Constructor\&. "
+.in -1c
+.SH "Detailed Description"
+.PP 
+Abstract base class for rendering text strings\&. 
+
+A text engine is responsible for rendering texts for a specific text format\&. They are used by \fBQwtText\fP to render a text\&.
+.PP
+\fBQwtPlainTextEngine\fP and \fBQwtRichTextEngine\fP are part of the Qwt library\&. The implementation of \fBQwtMathMLTextEngine\fP uses code from the Qt solution package\&. Because of license implications it is built into a separate library\&.
+.PP
+\fBSee also\fP
+.RS 4
+\fBQwtText::setTextEngine()\fP 
+.RE
+.PP
+
+.SH "Member Function Documentation"
+.PP 
+.SS "virtual void QwtTextEngine::draw (QPainter * painter, const QRectF & rect, int flags, const QString & text) const\fC [pure virtual]\fP"
+Draw the text in a clipping rectangle
+.PP
+\fBParameters\fP
+.RS 4
+\fIpainter\fP Painter 
+.br
+\fIrect\fP Clipping rectangle 
+.br
+\fIflags\fP Bitwise OR of the flags like in for QPainter::drawText() 
+.br
+\fItext\fP Text to be rendered 
+.RE
+.PP
+
+.PP
+Implemented in \fBQwtRichTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtMathMLTextEngine\fP\&.
+.SS "virtual double QwtTextEngine::heightForWidth (const QFont & font, int flags, const QString & text, double width) const\fC [pure virtual]\fP"
+Find the height for a given width
+.PP
+\fBParameters\fP
+.RS 4
+\fIfont\fP Font of the text 
+.br
+\fIflags\fP Bitwise OR of the flags used like in QPainter::drawText 
+.br
+\fItext\fP Text to be rendered 
+.br
+\fIwidth\fP Width
+.RE
+.PP
+\fBReturns\fP
+.RS 4
+Calculated height 
+.RE
+.PP
+
+.PP
+Implemented in \fBQwtRichTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtMathMLTextEngine\fP\&.
+.SS "virtual bool QwtTextEngine::mightRender (const QString & text) const\fC [pure virtual]\fP"
+Test if a string can be rendered by this text engine
+.PP
+\fBParameters\fP
+.RS 4
+\fItext\fP Text to be tested 
+.RE
+.PP
+\fBReturns\fP
+.RS 4
+true, if it can be rendered 
+.RE
+.PP
+
+.PP
+Implemented in \fBQwtRichTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtMathMLTextEngine\fP\&.
+.SS "virtual void QwtTextEngine::textMargins (const QFont & font, const QString & text, double & left, double & right, double & top, double & bottom) const\fC [pure virtual]\fP"
+Return margins around the texts
+.PP
+The textSize might include margins around the text, like QFontMetrics::descent()\&. In situations where texts need to be aligned in detail, knowing these margins might improve the layout calculations\&.
+.PP
+\fBParameters\fP
+.RS 4
+\fIfont\fP Font of the text 
+.br
+\fItext\fP Text to be rendered 
+.br
+\fIleft\fP Return value for the left margin 
+.br
+\fIright\fP Return value for the right margin 
+.br
+\fItop\fP Return value for the top margin 
+.br
+\fIbottom\fP Return value for the bottom margin 
+.RE
+.PP
+
+.PP
+Implemented in \fBQwtRichTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtMathMLTextEngine\fP\&.
+.SS "virtual QSizeF QwtTextEngine::textSize (const QFont & font, int flags, const QString & text) const\fC [pure virtual]\fP"
+Returns the size, that is needed to render text
+.PP
+\fBParameters\fP
+.RS 4
+\fIfont\fP Font of the text 
+.br
+\fIflags\fP Bitwise OR of the flags like in for QPainter::drawText 
+.br
+\fItext\fP Text to be rendered
+.RE
+.PP
+\fBReturns\fP
+.RS 4
+Calculated size 
+.RE
+.PP
+
+.PP
+Implemented in \fBQwtRichTextEngine\fP, \fBQwtPlainTextEngine\fP, and \fBQwtMathMLTextEngine\fP\&.
+
+.SH "Author"
+.PP 
+Generated automatically by Doxygen for Qwt User's Guide from the source code\&.