Rework the config to allow button column specification

[ZLLentz]

The buttons above and below each other in the column are often cognitively linked. This is because you see multiple buttons in a column at the same time at a glance, since the buttons are wider than they are tall (due to normal horizontal text). Unfortunately, these are actually separated by several many lines in the config file, due to the way we currently fill the columns (left to right, top to bottom, in order). So if there are a subset of buttons in a tab that are meant to be related to each other, it is confusing to arrange them in a coherent way.

The current schema is "here's a number of columns, here's my buttons, please lay them out for me"
I'd like to change it to "here's the contents of column 1, here's the contents of column 2, ..."

[klauer]

I think this makes a lot of sense and would be appreciated by users as well.

[ZLLentz]

Another option here might be: put this button at "column x, row y"