This tweaks the number of spaces before each token to create a consistent
layout. It doesn't (yet?) attempt to add or remove line breaks or
otherwise mess with the non-space characters in the code.
The main goal here is to get things to line up. zcl syntax is simple
enough that there's not much latitude for super-weird usage, and so if
someone does manage to write something weird (asymmetric breaking of
brackets between lines, etc) we won't try to fix it here.
Our approach here is to split the input into lines and then to split
each line into up to three cells which, when present, should have their
leftmost characters aligned (eventually) by the formatter.
