Add a MSCMD_ECHO_COMMAND_COMPAT define to be able to switch back to our
older but less broken behaviour at compile-time.
- Append a trailing space to commands when those have a parameter,
as well as after a command-block closing parenthesis.
- Space around redirection strings need to be switched around.
- Use ConOutPuts() instead of ConOutPrintf() for displaying strings that
are not printf formatted.
- When echo-ing/unparsing FOR command, any possible FOR variables
present in the FOR parenthesized list (before the "do" part) should be
substituted as well.
