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/qTabMessages.cpp

@@ -78,9 +78,9 @@ void qTabMessages::ExecuteCommand() {
 
     QString command = param.at(0);
     param.removeFirst();
-    LOG(logINFO) << "Executing Command:[" << command.toAscii().constData()
+    LOG(logINFO) << "Executing Command:[" << command.toLatin1().constData()
                  << "] with Arguments:["
-                 << param.join(" ").toAscii().constData() << "]";
+                 << param.join(" ").toLatin1().constData() << "]";
 
     process->setProcessChannelMode(QProcess::MergedChannels);
     process->start(command, param);
@@ -117,15 +117,15 @@ void qTabMessages::SaveLog() {
         outfile.setFileName(fName);
         if (outfile.open(QIODevice::WriteOnly | QIODevice::Text)) {
             QTextStream out(&outfile);
-            out << dispLog->toPlainText() << endl;
+            out << dispLog->toPlainText() << '\n';
             std::string mess =
                 std::string("The Log has been successfully saved to ") +
-                fName.toAscii().constData();
+                fName.toLatin1().constData();
             qDefs::Message(qDefs::INFORMATION, mess, "TabMessages::SaveLog");
             LOG(logINFO) << mess;
         } else {
             LOG(logWARNING) << "Attempt to save log file failed: "
-                            << fName.toAscii().constData();
+                            << fName.toLatin1().constData();
             qDefs::Message(qDefs::WARNING, "Attempt to save log file failed.",
                            "qTabMessages::SaveLog");
         }