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_docs.dm

@@ -14,9 +14,9 @@ Changes from tg DAL:
 		  - light_range; range in tiles of the light, used for calculating falloff,
 		  - light_power; multiplier for the brightness of lights,
 		  - light_color; hex string representing the RGB colour of the light.
-	  - SetLuminosity() is now set_light() and takes the three variables above.
+	  - setLuminousity() is now set_light() and takes the three variables above.
 		  - Variables can be left as null to not update them.
-	  - SetOpacity() is now set_opacity().
+	  - set_opacity() is now set_opacity().
 	  - Areas have luminosity set to 1 permanently, no hard-lighting.
 	  - Objects inside other objects can have lights and they properly affect the turf. (flashlights)
 	  - area/master and area/list/related have been eviscerated since subareas aren't needed.
@@ -51,7 +51,7 @@ turf: (lighting_turf.dm)
   - proc/lighting_clear_overlays():
 	  - Delete (manual GC) all light overlays on this turf, used when changing turf to space
   - proc/lighting_build_overlays():
-	  - Create lighting overlays for this turf. Called by ChangeTurf in case the turf is being changed to use dynamic lighting.
+	  - Create lighting overlays for this turf
 
 
 atom/movable/lighting_overlay: (lighting_overlay.dm)
@@ -64,4 +64,4 @@ atom/movable/lighting_overlay: (lighting_overlay.dm)
       - Change the lumcount vars and queue the overlay for update
   - proc/update_overlay()
 	  - Called by the lighting process to update the color of the overlay
-*/
+*/