[ZH] Upgrade to c++20 (#426)

Author: xezon

CMakeLists.txt

@@ -80,7 +80,7 @@ add_subdirectory(Dependencies/Utility)
 
 if (NOT IS_VS6_BUILD)
     # Set C++ standard
-    set(CMAKE_CXX_STANDARD 17)
+    set(CMAKE_CXX_STANDARD 20)
     set(CMAKE_CXX_STANDARD_REQUIRED ON)
     set(CMAKE_CXX_EXTENSIONS OFF)  # Ensures only ISO features are used