Bring back the ? Print statement

Building on the scenario of #102 there's another thing that might be simplified--basic output.

Today in the Immediate Window a user can type `? ` to print the value of that expression. This doesn't work in normal VB though it did work in VB6 and earlier as well as QBasic. We already parse this but the parser only excepts it legally in .vbx files.

What problem does this solve? Knowing what the correct way to printf debug in context. Depending on the app type it could be correct/preferred to:

```
Console.WriteLine()
Debug.WriteLine()
Trace.WriteLine()
MessageBox.Show() ' Dangerously modal
Response.Write()
```

and I'm sure there are several others. If we could somehow tie this into .NET's debug or trace listeners could we abstract away all these variations?