dump_idgames: issue #150; shorten output messages

- `dump_idgames` is pretty simple in what it does, it doesn't need a
  lot of output to do it's thing
idGamesFile: issue #150; added guts of dump_ini_block()

- `dump_ini_block()` dumps the `idGamesFile` object as an INI block,
  so that it can be parsed with `INIFile` later on