[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Add accurate check for console stdio + add associated primitive (#254)

[akgrant43]

Hi Vincent,

In cygwin you can test pipes with:

```
$ cat | PharoConsole Pharo7.0.image | tee /dev/null
```

It's also a hacky way to get terminal i/o working in a cygwin terminal.

In a windows console:

```
echo "hello world" | PharoConsole Pharo7.0.image
```

Should allow you to test stdin at least (untested).

In both cygwin terminals and windows consoles file i/o can be tested with:

```
PharoConsole Pharo7.0.image < a.txt > b.txt
```

HTH,
Alistair

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