feat: add new helper for scoped enum type.

- Add EnumHelper for bitwise operation of scoped enum type (copied from libcmo21)
- Enrich the return value of ConfigManager load function to present more infomation of loading.
- update testbench for new added feature and modification.
- add document for new added feature.

src/CMakeLists.txt

@@ -31,6 +31,7 @@ FILES
     ConsoleHelper.hpp
     DialogHelper.hpp
     EncodingHelper.hpp
+    EnumHelper.hpp
     ExceptionHelper.hpp
     StdPatch.hpp
     IOHelper.hpp