PIXEL_MOVEMENT_MODE is unimplemented

[Hinaichigo]

When attempting to compile /vg/station, the following error occurs: Error at code\world.dm:14:37: Unknown identifier "PIXEL_MOVEMENT_MODE" At the following location:

6 /world
7 	mob = /mob/new_player
8 	turf = /turf/space
9 	view = "15x15"
10 	cache_lifespan = 0	//stops player uploaded stuff from being kept in the rsc past the current session
11 	//loop_checks = 0
12 	icon_size = WORLD_ICON_SIZE
13 	sleep_offline = FALSE
14 	movement_mode = PIXEL_MOVEMENT_MODE

It seems that PIXEL_MOVEMENT_MODE is built into BYOND.