The FSC step is added to the wizard and takes full advantage of Redux
for state management.
This is still a work in progress.
Supported features:
1. Select partition mountpoint prefix (e.g. /var, /home)
2. Edit partition mountpoint suffix (e.g. /home/videogames)
3. Change displayed units (KiB, MiB, GiB)
Supported but buggy features:
1. Edit partition size
Unsupported features:
1. Add partitions
2. Remove partitions
3. Validation
