--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/Utils.h

@@ -277,6 +277,14 @@ protected:
 	x(const x& other) = delete; \
 	const x& operator=(const x& other) = delete//Semicolon deliberately omitted to force it on the caller.
 
+//Use this if the body of the destructor will be implemented in a cpp file and the type is templated.
+#define SINGLETON_DERIVED_DECL_T(x, T) \
+	friend class Singleton<x<T>>; \
+	public: \
+	~x(); \
+	x(const x& other) = delete; \
+	const x& operator=(const x& other) = delete//Semicolon deliberately omitted to force it on the caller.
+
 //Use this if the body of the destructor is empty and is will be implemented inline in the header file.
 #define SINGLETON_DERIVED_IMPL(x) \
 	friend class Singleton<x>; \
@@ -285,6 +293,14 @@ protected:
 	x(const x& other) = delete; \
 	const x& operator=(const x& other) = delete
 
+//Use this if the body of the destructor is empty and is will be implemented inline in the header file and the type is templated.
+#define SINGLETON_DERIVED_IMPL_T(x, T) \
+	friend class Singleton<x<T>>; \
+	public: \
+	~x(){} \
+	x(const x& other) = delete; \
+	const x& operator=(const x& other) = delete
+
 /// <summary>
 /// The calculations in some variations were changed from what they were in flam3/Apophysis to match Chaotica.
 /// Some users prefer the old functionality, so provide an option to retain it.