Manage the upgrade path from the old items_control.txt to items_control_new.txt.
- On load, check whether a control/items_control.txt file exists and has uncommented lines in it. If so:
- If a control/items_control_new.txt file already exists, display a warning, then go to step 2.
- If a control/items_control_old.txt file already exists, display a warning, then go to step 2.
- Display a message to the user, offering to upgrade the control/items_control.txt file to control/items_control_new.txt. If the user DOES NOT accept, go to step 2.
- Rename control/items_control.txt to control/items_control.txt.old.
- Load control/items_control.txt.old and convert the contents to the correct format for control/items_control_new.txt.
- Save control/items_control_new.txt.