config：配置更新。

.gitignore

@@ -1,2 +1,5 @@
 build
-*.user
+.vs
+.cache
+cmake-*
+CMakeLists.txt

CMakeLists.txt

@@ -1,8 +1,8 @@
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.16)
 
 project(mail-cpp LANGUAGES CXX)
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 # QT 中使用 VCPKG 在项目中的 Initial Configure 中设置
@@ -12,11 +12,7 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 # -DCMAKE_TOOLCHAIN_FILE:STRING=E:/vcpkg/scripts/buildsystems/vcpkg.cmake
 
 if (MSVC)
-    if (GBK)
         add_compile_options(/source-charset:utf-8)
-    else()
-        add_compile_options(/utf-8)
-    endif()
 endif()
 
 find_package(Poco REQUIRED NetSSL Foundation Zip)