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/qTabSettings.cpp

@@ -18,7 +18,6 @@ qTabSettings::qTabSettings(QWidget *parent, Detector *detector)
 qTabSettings::~qTabSettings() {}
 
 void qTabSettings::SetupWidgetWindow() {
-
     comboHV->hide();
     lblComboHV->hide();
     lblSpinHV->hide();
@@ -402,7 +401,7 @@ void qTabSettings::SetGainMode(int index) {
     }
 
     LOG(logINFO) << "Setting Gain Mode to "
-                 << comboGainMode->currentText().toAscii().data();
+                 << comboGainMode->currentText().toLatin1().data();
     auto val = static_cast<slsDetectorDefs::gainMode>(index);
     try {
 
@@ -449,7 +448,7 @@ void qTabSettings::GetDynamicRange() {
 
 void qTabSettings::SetDynamicRange(int index) {
     LOG(logINFO) << "Setting dynamic range to "
-                 << comboDynamicRange->currentText().toAscii().data();
+                 << comboDynamicRange->currentText().toLatin1().data();
     try {
         switch (index) {
         case DYNAMICRANGE_32: