Issue-#153 Basic in/out console functionality

[Robert]

For the issue see : https://redmine.blackboxframework.org/issues/153
For the discussion see: viewtopic.php?f=41&t=602
For the diffs see: https://redmine.blackboxframework.org/p ... 945a8a09f1

I am currently investigating some potential changes to TextSetters, and want to insert some temporary diagnostic print statements.
If I add the IMPORT statement "Fmtrs := LibFmtrs", my usual way of printing stuff, and do nothing else, it crashes BlackBox. So I, for one, have a real use for this basic low-level functionality.

[Robert]

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