[format] add a list support back by also finding a way to deal with spaces in the 'width' parameter

[porres]

list output has challenges, which aren't taken care of in MAX and cyclone/sprintf, in which this object was based on.

The first problem is that a symbol with escaped characters would split into different atoms. I was able to fix that by force adding an escape character in the space and checking for it, but the issue still remained for the case where you'd have a width parameter with spaces padding to the left or right.

Or perhaps there's just a simpler way and I could expand things with how the current simplified object works now.