FALSE, Befunge-93 and BrainF**k

The 'Hardy' work continues on the now rather grandly named 'esoteric interpreter suite'. The BrainF**k interpreter did not take long at all to implement (no surprise there I suppose) but required some refactoring of the 'core' interpreter abstractions; this continues as the focus has now shifted to Befunge-93. I thought I'd ease myself into the 'funge' language family - Nefunge is the ultimate goal :-)