vg Holomaps (#2844)

Ports vorestation's implementation of /vg/'s holomaps.

Holomaps are an in-game object that shows a map of (most) of the station with departments highlighted, to aid in navigation around the station. Maintenance, high-security, and asteroid areas are excluded from the maps.

Adds approximately 1.5 seconds to server boot to generate maps.

Holomaps were added at:

Arrivals shuttle dock, north of checkpoint.
Surface level lift.
By entrance to security on main level.
North of the kitchen.
South of Engineering, near tech storage.
Beside the IA office.
Near the lift on each sub-level department.

code/modules/turbolift/turbolift_areas.dm

@@ -10,3 +10,5 @@
 	var/lift_floor_name = null
 	var/lift_announce_str = "Ding!"
 	var/arrival_sound = 'sound/machines/ding.ogg'
+
+	holomap_color = HOLOMAP_AREACOLOR_LIFTS