Merge pull request #4371 from tigercat2000/better_blueprints

Ports holomap blueprints from tg/vg.

code/modules/power/cable.dm

@@ -25,6 +25,7 @@ By design, d1 is the smallest direction and d2 is the highest
 /obj/structure/cable
 	level = 1
 	anchored =1
+	on_blueprints = TRUE
 	var/datum/powernet/powernet
 	name = "power cable"
 	desc = "A flexible superconducting cable for heavy-duty power transfer"

code/modules/power/power.dm

@@ -10,6 +10,7 @@
 	name = null
 	icon = 'icons/obj/power.dmi'
 	anchored = 1.0
+	on_blueprints = TRUE
 	var/datum/powernet/powernet = null
 	use_power = 0
 	idle_power_usage = 0