[Ch 9, 10] Save log files to different folder than save files to avoid using up steam cloud file count

Chapters 9 and 10 save log files to the same place as save files. As per #111, steam cloud has a file limit, which varies per chapter.

To avoid using up the file limit, log files should be placed in a different folder than the save files.

Note that we have two different save files, the save files which are generated by the game (`Player.log` and `Player-prev.log`), and the mod log files which we added to debug the layer error issue (`mod_log_1.txt`, `mod_log_2.txt`). Both should not be put in the steam cloud folder.

Look at the save file handling code in Chapters 9 and 10 to find where log files (Player.log, Player-prev.log, mod_log_1.txt, mod_log_2.txt) are written. Change the output directory for these logs to a non-Steam Cloud folder. Test by running the game and verifying logs appear in the new location while saves remain in the original folder.

Written by the indexing model from the issue text.