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/Flatten.hpp

@@ -0,0 +1,120 @@
+#ifndef RFL_FLATTEN_HPP_
+#define RFL_FLATTEN_HPP_
+
+#include <algorithm>
+#include <string_view>
+#include <tuple>
+#include <type_traits>
+#include <utility>
+
+namespace rfl {
+
+/// Used to embed another struct into the generated output.
+template <class T>
+struct Flatten {
+  /// The underlying type.
+  using Type = std::remove_cvref_t<T>;
+
+  Flatten() = default;
+
+  Flatten(const Type& _value) : value_(_value) {}
+
+  Flatten(Type&& _value) noexcept : value_(std::forward<Type>(_value)) {}
+
+  Flatten(const Flatten& _f) = default;
+
+  Flatten(Flatten&& _f) noexcept = default;
+
+  template <class U>
+  Flatten(const Flatten<U>& _f) : value_(_f.get()) {}
+
+  template <class U>
+  Flatten(Flatten<U>&& _f) : value_(_f.get()) {}
+
+  template <class U, typename std::enable_if<std::is_convertible_v<U, Type>,
+                                             bool>::type = true>
+  Flatten(const U& _value) : value_(_value) {}
+
+  template <class U, typename std::enable_if<std::is_convertible_v<U, Type>,
+                                             bool>::type = true>
+  Flatten(U&& _value) : value_(_value) {}
+
+  ~Flatten() = default;
+
+  /// Returns the underlying object.
+  Type& get() { return value_; }
+
+  /// Returns the underlying object.
+  const Type& get() const { return value_; }
+
+  /// Returns the underlying object.
+  Type& operator()() { return value_; }
+
+  /// Returns the underlying object.
+  const Type& operator()() const { return value_; }
+
+  /// Assigns the underlying object.
+  Flatten& operator=(const T& _value) {
+    value_ = _value;
+    return *this;
+  }
+
+  /// Assigns the underlying object.
+  Flatten& operator=(T&& _value) {
+    value_ = std::forward<Type>(_value);
+    return *this;
+  }
+
+  /// Assigns the underlying object.
+  template <class U, typename std::enable_if<std::is_convertible_v<U, Type>,
+                                             bool>::type = true>
+  Flatten& operator=(const U& _value) {
+    value_ = _value;
+    return *this;
+  }
+
+  /// Assigns the underlying object.
+  Flatten& operator=(const Flatten& _f) = default;
+
+  /// Assigns the underlying object.
+  Flatten& operator=(Flatten&& _f) = default;
+
+  /// Assigns the underlying object.
+  template <class U>
+  Flatten& operator=(const Flatten<U>& _f) {
+    value_ = _f.get();
+    return *this;
+  }
+
+  /// Assigns the underlying object.
+  template <class U>
+  Flatten& operator=(Flatten<U>&& _f) {
+    value_ = std::forward<U>(_f);
+    return *this;
+  }
+
+  /// Three-way comparison operator
+  template <class U>
+  auto operator<=>(const Flatten<U>& _f) const {
+    return value_ <=> _f.value_;
+  }
+
+  /// Equality comparison operator.
+  template <class U>
+  bool operator==(const Flatten<U>& _f) const {
+    return value_ == _f.get();
+  }
+
+  /// Assigns the underlying object.
+  void set(const Type& _value) { value_ = _value; }
+
+  /// Assigns the underlying object.
+  void set(Type&& _value) { value_ = std::forward<Type>(_value); }
+
+  /// The underlying value.
+  Type value_;
+};
+
+}  // namespace rfl
+
+#endif