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/DefaultIfMissing.hpp

@@ -0,0 +1,19 @@
+#ifndef RFL_DEFAULTIFMISSING_HPP_
+#define RFL_DEFAULTIFMISSING_HPP_
+
+namespace rfl {
+
+/// This is a "fake" processor - it doesn't do much in itself, but its
+/// inclusion instructs the parsers to use the default values for missing
+/// fields.
+struct DefaultIfMissing {
+ public:
+  template <class StructType>
+  static auto process(auto&& _named_tuple) {
+    return _named_tuple;
+  }
+};
+
+}  // namespace rfl
+
+#endif