win_println_them_message()
win_println_incoming_muc_msg()
In aa3693daa211b36c78d136d5a1ee9f3258e21352 I renamed `win_println_me_message()` -> `win_print_outgoing_muc_msg()`. Now: `win_println_them_message()` -> `win_println_incoming_muc_msg()` to be more consistent and descriptive.