--User changes

-Fix stylesheets.
-Make various fields in the options window be resettable via double click.
-Get stylesheets working properly on Windows and Linux with Qt6.
-Set default style to Fusion.

--Code changes
-Get build and deployment scripts working with latest versions of Qt6, AppImage, and various library dependencies.
-Add two new macros so it would build with the latest gcc: SINGLETON_DERIVED_DECL_T and SINGLETON_DERIVED_IMPL_T.
-Small changes to opencl.hpp.
-Center progress bars on Linux.
-Proper sizing of vertical header on the xaos visualization table on Linux.

Builds/QtCreator/defaults.pri

@@ -94,7 +94,10 @@ win32 {
 	LIBS += -ljpeg
 	LIBS += -lpng
 	LIBS += -lpthread
-	LIBS += -lOpenEXR
+	LIBS += -lIlmImf
+	LIBS += -lHalf
+	LIBS += -lImath
+	LIBS += -lIex
 
         unix:!macx {
             LIBS += -lxml2