ShaderNode: Add save/load

src/ShaderNode/Enums.inl

@@ -1 +1,15 @@
 #include <ShaderNode/Enums.hpp>
+
+template<typename T>
+std::optional<T> DecodeEnum(const std::string_view& str)
+{
+	constexpr std::size_t ValueCount = static_cast<std::size_t>(T::Max) + 1;
+	for (std::size_t i = 0; i < ValueCount; ++i)
+	{
+		T value = static_cast<T>(i);
+		if (str == EnumToString(value))
+			return value;
+	}
+
+	return {};
+}