Minor lighting performance tweaks (#3298)

changes:

Sunlight prebake now happens during MC Initialize instead of in the lobby.
Openturf no longer ticks in the lobby.
Openturf has been promoted to a normal SS, from SS_BACKGROUND.
Lighting no longer ticks in the lobby.
Inlined directional lighting's coordinate filter.
Directional lighting wedge caching now properly works with face-direction.

code/controllers/subsystems/lighting.dm

@@ -5,7 +5,6 @@ var/datum/controller/subsystem/lighting/SSlighting
 /datum/controller/subsystem/lighting
 	name = "Lighting"
 	wait = LIGHTING_INTERVAL
-	flags = SS_FIRE_IN_LOBBY
 
 	priority = SS_PRIORITY_LIGHTING
 	init_order = SS_INIT_LIGHTING

code/controllers/subsystems/openturf.dm

@@ -8,7 +8,6 @@
 
 /datum/controller/subsystem/openturf
 	name = "Open Space"
-	flags = SS_BACKGROUND | SS_FIRE_IN_LOBBY
 	wait = 1
 	init_order = SS_INIT_OPENTURF
 	priority = SS_PRIORITY_OPENTURF