ADD `DATA STACK`
======

USAGE
------
  ?   push data
  :   pop data

SEE `example/strcpy.bf` for example usage
ADD NEW FEATURE `ASSIGN`
==========

USAGE
------
    =
       followed by
       @
       ^
       ?
       &
       $
NEW EXTENSION FOR `ASSIGN`
========

   =
      <  assign left value to current
      >  assign right value to current