--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.

Source/Ember/PaletteList.h

@@ -49,7 +49,7 @@ public:
 	bool IsModifiable(const string& filename);
 	const map<string, vector<Palette<T>>>& Palettes() const;
 
-	SINGLETON_DERIVED_DECL(PaletteList<T>);
+	SINGLETON_DERIVED_DECL_T(PaletteList, T);
 private:
 	PaletteList();
 	bool Save(const string& filename);