Port tg/paradise/good soft-edge lighting

Ports https://github.com/ParadiseSS13/Paradise/pull/6161
Its merged in nearly verbatim as far as the lighting module goes.
Changes outside the lighting module are merged based on our codebase.

code/modules/lighting/lighting_setup.dm

@@ -0,0 +1,16 @@
+/proc/create_all_lighting_overlays()
+	for(var/zlevel = 1 to world.maxz)
+		create_lighting_overlays_zlevel(zlevel)
+
+/proc/create_lighting_overlays_zlevel(var/zlevel)
+	ASSERT(zlevel)
+
+	for(var/turf/T in block(locate(1, 1, zlevel), locate(world.maxx, world.maxy, zlevel)))
+		if(!T.dynamic_lighting)
+			continue
+
+		var/area/A = T.loc
+		if(!A.dynamic_lighting)
+			continue
+
+		new /atom/movable/lighting_overlay(T, TRUE)