Allow executing multiple chunks of code in the same module.
Allow executing multiple chunks of code in the same module.

This means successive calls to wrenInterpret() will run in
the same context. Allows variables to span calls in the REPL.

minirop/wren,minirop/wren,Nelarius/wren,foresterre/wren,bigdimboom/wren,foresterre/wren,munificent/wren,Rohansi/wren,Nave-Neel/wren,Nelarius/wren,Rohansi/wren,minirop/wren,minirop/wren,munificent/wren,munificent/wren,bigdimboom/wren,Nelarius/wren,Nave-Neel/wren,munificent/wren,munificent/wren,foresterre/wren,bigdimboom/wren,minirop/wren,foresterre/wren,Nave-Neel/wren,Nelarius/wren,Rohansi/wren,Nelarius/wren,Nave-Neel/wren,Rohansi/wren,munificent/wren,bigdimboom/wren,foresterre/wren