Move files to exp_legacy

exp_legacy/module/modules/addons/pollution-grading.lua

@@ -0,0 +1,16 @@
+--- Makes polution look much nice of the map, ie not one big red mess
+-- @addon Pollution-Grading
+
+local Event = require 'utils.event' --- @dep utils.event
+local config = require 'config.pollution_grading' --- @dep config.pollution_grading
+
+local delay = config.update_delay * 3600 -- convert from minutes to ticks
+Event.on_nth_tick(delay, function()
+    local surface = game.surfaces[1]
+    local true_max = surface.get_pollution(config.reference_point)
+    local max = true_max*config.max_scalar
+    local min = max*config.min_scalar
+    local settings = game.map_settings.pollution
+    settings.expected_max_per_chunk = max
+    settings.min_to_show_per_chunk = min
+end)