chore: switch to CMake build system.

- switch to CMake build system and delete original project files because Visual Studio supports CMake project debugging.
- there is a UTF-8 bug for library after switching, but I don't know why it happends. maybe fixed in future.

testbench/CMakeLists.txt

@@ -0,0 +1,25 @@
+# Create executable testbench
+add_executable(Testbench
+    main.cpp
+)
+# Add YYCC as its library
+target_include_directories(Testbench
+PRIVATE
+    
+)
+target_link_libraries(Testbench
+PRIVATE
+    YYCCommonplace
+)
+# Setup C++ standard
+set_target_properties(Testbench
+PROPERTIES
+    CXX_STANDARD 17
+    CXX_STANDARD_REQUIRED 17
+    CXX_EXTENSION OFF
+)
+# Order build as UTF-8 in MSVC
+target_compile_options(YYCCommonplace
+PRIVATE
+    $<$<CXX_COMPILER_ID:MSVC>:/utf-8>
+)