Don't use %f to serialize floats to JSON but use the json formatter
because in some locales, the decimal point becomes a , which does not
parse as a float anymore.
Also reformat some lines.
Websites like squig.link or https://www.autoeq.app/ generate a file for
parametric equalization for a given target, but this is not a format
that can be directly given to filter chain module.
This module translates the file to filter chain module arguments and
then loads the filter chain module with these arguments.
