StringUtils: add compiler parameters checking for Format()/FormatV()

As title says.

Not yet, but they will be used in other places and I don't want to add additional checking like "ifdef bla1 def endif ifdef bla2 def endif".
Can be moved to helper header "param_check_macro.h" with more GCC macros like PARAM2_PRINTF_FORMA, PARAM3_PRINTF_FORMAT.