[Feature Request]: parameter to define the column order of the tables

[mattkorb]

Feature description

I received the following feedback from a programmer trying the falcon package:
"Personally I think it would be nice to have a parameter that can define the column order by the user within make_table() functions. I have to type all treatment arms into levels. Hypothetically, if anything changed, I would have to revisit and manually update in each table program. "
Maybe we should add a parameter fo this. :)