fs.mitm: experimental support for save redirection to sd.

common/defaults/system_settings.ini

@@ -15,4 +15,10 @@ dmnt_cheats_enabled_by_default = u8!0x1
 ; Controls whether dmnt should always save cheat toggle state
 ; for restoration on new game launch. 1 = always save toggles,
 ; 0 = only save toggles if toggle file exists.
-dmnt_always_save_cheat_toggles = u8!0x0
+dmnt_always_save_cheat_toggles = u8!0x0
+; Controls whether fs.mitm should redirect save files
+; to directories on the sd card.
+; 0 = Do not redirect, 1 = Redirect.
+; NOTE: EXPERIMENTAL
+; If you do not know what you are doing, do not touch this yet.
+fsmitm_redirect_saves_to_sd = u8!0x0