Change default alignment of numbers

Just found the app and it works great. One issue, if you have a numeric column next to a text column the default alignments in the app mean the the numbers are right next to the text and difficult to read. Perhaps have everything align left?

Start by reproducing the alignment behavior in the Mac app with a numeric column beside a text column, then trace where default column alignment is chosen. Done means the default alignment is consistent with the agreed behavior and the mixed-column case is easier to read.

Written by the indexing model from the issue text.