Implement a sanity check helper which determines if the partition is a system drive or not based on the %SystemDrive% environment variable, preventing the user from nuking accidentally the partition with ReactOS system files installed. :P
NOTE: This code serves as a temporary measure to prevent accidental formatting of the system drive. In the future most of this code has to be totally rewritten (and stopping syncing with WINE altogether) as well as FMIFS library code so that we're on par in terms of compatibility with Windows.
This is a slight refactor of InsertDefaultClusterSizeForFs() code with the goal to avoid having the same code for FAT-related and EXT2/BtrFS filesystems.
FATX is listed as a filesystem for format within the list but it's classed out from current proposed filesystems, thus spamming the debug output and not allowing to actually format a storage drive with this FS.
CORE-17272
