warn that a script is deprecated


local du = require "lib/dtutils"
du.deprecated(script_name, deprecation_time)

script_name - string - the name of the script, i.e. “contrib/clear_GPS”
deprecation_time - string - when the script will be removed, i.e. “darktable release 4.0”


deprecated gives users a warning that a script is outdated or no longer useful and will be removed at the specified time