Pipeline log files permission issues

[AnHeuermann]

Issue Description

OMJulia starts an omc process that writes to stdout.log and stderr.log. When an additional process starts or the previous OMJulia session wasn't closed correctly I have to restart Julia to close and remove these files.

                withenv("OPENMODELICAHOME" => omhome) do
                    this.omcprocess = open(pipeline(`$ompath $args2 $args3$args4`, stdout="stdout.log", stderr="stderr.log"))
                end

Suggested Changes

Write to unique IO streams in memory for each OMJulia session.
IOBuffer is breaking on Windows and isn't save to use, see JuliaLang/julia#39311.
Using undocumented Base.BufferStream() seems to work, though:

  out = Base.BufferStream()
  err = Base.BufferStream()
  try
      withenv("OPENMODELICAHOME" => omhome) do
          this.omcprocess = open(pipeline(`$ompath $args2 $args3$args4`, stdout=out, stderr=err))
      end
    # stdout = read(out, String)
  catch e
    println(read(err, String))
    rethrow(e)
  finally
    close(out)
    close(err)
  end

Versions 'n stuff

• OpenModelica: v1.22.0-dev-285-gf718aa4020-cmake
• OS: Windows 11
• Julia v1.9.2

[AnHeuermann]

I tried to use Base.BufferStream() but it seems to get stuck on read(outStream, String). Maybe because the omc process isn't stopped at this point.
Maybe related to JuliaLang/julia#46869

I'll just remove the logging. I added it for debugging purpose, but if this breaks the Windows version of OMJulia there is no point in debugging it anyway.