Update ChewingTextService.cpp

We modify to add ctrl+num string to process when chewing's state !=composition mode  .

read dictionary.txt from C:\Users\"UserName"\dictionary.txt
and the file type has to be UTF-8.

we can let user define their string from ctrl+1 to ctrl+9 

I prefer to let user can add string to ctrl+num when state =composition mode
But now I can't write buffer to XX.txt = =".
I will commit new version after solving it.