Replace char with UTF8 in stream.h

engine/source/io/stream.h

@@ -169,7 +169,7 @@ class Stream {
    }
    DECLARE_OVERLOADED_WRITE(S8)
    DECLARE_OVERLOADED_WRITE(U8)
-   DECLARE_OVERLOADED_WRITE(char)
+   DECLARE_OVERLOADED_WRITE(UTF8)
 
    DECLARE_ENDIAN_OVERLOADED_WRITE(S16)
    DECLARE_ENDIAN_OVERLOADED_WRITE(S32)