* [DISKPART] Fix help for multi-word command crashing.
When the HELP command is executed for a multi-word command,
for example "HELP CREATE PARTITION PRIMARY", diskpart crashes.
This happens because before the desired form of the command
is encountered, its single word form is found - since the first word
of the command matches the one HELP is looking for, it tries to
compare the second word of the input command with the second
(nonexistent) word of the encountered single word command,
which is NULL. This results in diskpart crashing.
The fix makes HELP check if the to-be-compared word is not NULL,
before calling wcsicmp.
- Extend the command table to support subcommands.
- Get rid of the existing subcommand code.
- Use the new subcommand suport for the help system.
- Start work on the create command.
@Translators: Please do not translate any changes yet, because I will improve help system in one of the next steps.
