feat(reflect-cpp): Switched from glaze -> reflect cpp

A bug was discovered in glaze which prevented valid toml output. We have
switched to toml++ and reflect-cpp. The interface has remained the same
so this should not break any code

build-config/reflect-cpp/include/rfl/ExtraFields.hpp

@@ -0,0 +1,15 @@
+#ifndef RFL_EXTRAFIELDS_HPP_
+#define RFL_EXTRAFIELDS_HPP_
+
+#include "Object.hpp"
+
+namespace rfl {
+
+/// Used to embed additional fields for which the names cannot be known in
+/// advance and can therefore not be encoded in the struct.
+template <class T>
+class ExtraFields : public Object<T> {};
+
+}  // namespace rfl
+
+#endif