refactor: migrate windows specific content.

- move com, dialog and winfct function into new place.
- add testbench for com and winfct.
- dialog now still not working.

testbench/CMakeLists.txt

@@ -22,6 +22,9 @@ PRIVATE
     yycc/encoding/stl.cpp
     yycc/encoding/windows.cpp
     yycc/encoding/iconv.cpp
+    yycc/windows/com.cpp
+    #yycc/windows/dialog.cpp
+    yycc/windows/winfct.cpp
     
     yycc/carton/pycodec.cpp
 )