Revamp config format, add saving of Rosalina opt.

(menu combo & 3dsx title ID)

sysmodules/rosalina/include/menus/miscellaneous.h

@@ -33,6 +33,7 @@ extern Menu miscellaneousMenu;
 
 void MiscellaneousMenu_SwitchBoot3dsxTargetTitle(void);
 void MiscellaneousMenu_ChangeMenuCombo(void);
+void MiscellaneousMenu_SaveSettings(void);
 void MiscellaneousMenu_InputRedirection(void);
 void MiscellaneousMenu_PowerOff(void);
 void MiscellaneousMenu_Reboot(void);