Moved strbuf_nputs to another STRBUF::append method
Moved strbuf_nputc to another STRBUF::append method
Changed uses of strbuf_puts_nl that were passing in string literals to just add the newline to the string literal itself
Added some output operators for STRBUF to handle remaining strbuf_puts_nl cases; wishing for unit-tests
Moved strbuf_putn to an operator<< for ints