Optional support for automatically converting single square bracket short codes to double for Hanna compatibility.

I also fixed an issue when populating the default data. It was grabbing the value instead of the index which worked fine for the field and template names because indexes and values were the same, but it didn't work in other scenarios.

I was also going to change "customNames" to something more generic, because it's not really appropriate for other config settings like this shortcode conversion option, but thought I should let you change that as you think best.