- No longer relies on operating system for mounting FAT partition
when applying 'advanced settings'
- change '__attribute__ ((packed))' to '#pragma pack()' as the
mingw version we are using for Windows has a bug with the former
- If a drive is formatted APFS it will have a seperate disk
devices for physical drive (e.g. /dev/disk2) and volumes
(e.g. /dev/disk3).
Need to unmount all, or opening the device for
writing will subsequently fail.
(User will see an "Error running authopen" error in Imager
in that case).
- Also do not show APFS volumes seperately in the disk
selection dialog. List mount points under physical drive
instead.
Closes#501
