Change array rule back to use h_many

This reverts the part of commit f7dbb2ac that reworked the definition of arrays into explicit grammar recursion in order to make 'obj' compile with LALR. That project never came to fruition and with packrat it causes a recursive function call for every array element, exhausting the stack with large arrays.

Fixes #26 (closed). Also removes the LALR TODO item which closes #13 (closed).