committed instantly now.
- Updated the drive handling code so it loads direct from the
registry.
- Removed DRIVE_DESC, drives are keyed by drive letter now.
- Documented drive_available_mask.
- Simplified the code somewhat.
- Rename enable_cdrom_box to enable_labelserial_box to better reflect
purpose.
- Rename IDC_BOX_CDROM to IDC_BOX_LABELSERIAL.
- Support for editing label for all drives, allow editing of
serial/device for CD-ROMS.