Fixed a number of buffer overflows with cmd, bug #13469 (try 2)

[Diaa Sami]

Fixed a number of buffer overflows in cmd(based on limits of Windows cmd)

- Each of quals, param1 and param2 can be almost as long as MAXSTRING(actually a few characters shorter) so their length was changed.
- Fixed an overflow with long program names(which is stored in stemofsearch), it can't be equal to or longer than MAX_PATH.
- Fixed an overflow in WCMD_DumpCommands with long commands by removing the fixed-length buffer and using WINE_TRACE instead of buffer+sprintf.
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