Initial (outdated) draft implement of newline adj.

[jmobrien]

Thought I might as well submit the draft PR in case you want to use any part of it.

This just creates a new argument (called .newline_adj currently) for exported functions autofit and dim_pretty. This ultimately propagates to text_metric to select whether you want newline adjustment or not, with a (now outdated) new approach implemented if you want the adjustment.

As such, I think this should have preserved the other elements of autofitting/prettying like padding or manual adjustment. But I haven't yet seen it in action, so it could be missing things.

Feel free to adjust/re-make/discard at your pleasure. I'll come back to it if I can, but it will probably be a few days at least. Thanks again!

[davidgohel]

many thanks @jmobrien I'll give a try to see how it can be integrated (and let you know when I will)