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)

slsDetectorGui/src/qCloneWidget.cpp

@@ -49,7 +49,6 @@ void qCloneWidget::SetupWidgetWindow(QString title) {
                            std::string("  -  ") + Logger::Timestamp();
     setWindowTitle(QString(winTitle.c_str()));
 
-    boxPlot->setFont(QFont("Sans Serif", qDefs::Q_FONT_SIZE, QFont::Normal));
     boxPlot->setTitle(title);
 
     // 1d
@@ -108,7 +107,7 @@ void qCloneWidget::SavePlot() {
     QString fName = filePath + QString('/') + fileName + QString("_clone") +
                     QString("%1").arg(id) + QString("_acq") +
                     QString("%1").arg(acqIndex) + QString(".png");
-    LOG(logINFO) << "Saving Clone:" << fName.toAscii().constData();
+    LOG(logINFO) << "Saving Clone:" << fName.toLatin1().constData();
     // save
     QImage img(centralwidget->size().width(), centralwidget->size().height(),
                QImage::Format_RGB32);