ISOProperties loads codes using ActionReplay::LoadCodes which actually applies
the codes to the global state. If a game is running then that games receives
all the codes (and ACTIVE status) from the second game being shown in
ISOProperties which is not desirable.
titles.txt is read into a map and passed to the GameListItem
constructor, making game list scanning a bit more efficient.
ISOPropreties's constructor is changed to take a GameListItem as an
argument instead of creating one on its own, because ISOPropreties
doesn't have the titles.txt map that the GameListItem constructor wants.
