feat(Core/Config): rework config and delete ACE inherited (#4608)

src/common/Utilities/advstd.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016+ AzerothCore <www.azerothcore.org>, released under GNU AGPL v3 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-AGPL3
+ * Copyright (C) 2021+ WarheadCore <https://github.com/WarheadCore>
+ */
+
+#ifndef _ACORE_ADV_STD_H_
+#define _ACORE_ADV_STD_H_
+
+#include <cstddef>
+#include <type_traits>
+
+// this namespace holds implementations of upcoming stdlib features that our c++ version doesn't have yet
+namespace advstd
+{
+    // C++20 advstd::remove_cvref_t
+    template <class T>
+    using remove_cvref_t = std::remove_cv_t<std::remove_reference_t<T>>;
+
+    // C++20 std::type_identity
+    template <typename T>
+    struct type_identity
+    {
+        using type = T;
+    };
+
+    // C++20 std::type_identity_t
+    template <typename T>
+    using type_identity_t = typename type_identity<T>::type;
+}
+
+#endif // _ADV_STD_H_