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/slsDetectorPlotting/include/SlsQt2DPlot.h

@@ -19,7 +19,7 @@ class SlsQt2DPlot : public QwtPlot {
     Q_OBJECT
 
   public:
-    SlsQt2DPlot(QWidget * = NULL);
+    SlsQt2DPlot(QWidget * = NULL, bool gain = false);
     ~SlsQt2DPlot();
     void SetTitle(QString title);
     void SetXTitle(QString title);
@@ -87,6 +87,8 @@ class SlsQt2DPlot : public QwtPlot {
   private:
     void SetupZoom();
     void SetupColorMap();
+    bool gainPlot{false};
+
     QwtLinearColorMap *myColourMap(QVector<double> colourStops);
     QwtLinearColorMap *myColourMap(int log = 0);