Spawns the given command line string in sCmdLine. This returns non-zero if successful, or zero if errors.
If sWorkingDirectory is not Nil, then the working directory is used. If sWorkingDirectory is Nil, then the current project home directory iis used.
If fWait is non-zero, then the function will not return until the process is finished. Otherwise, it returns immediately. If the process is another windows application, it returns immediately regardless of fWait.