Adds AI control beacons for exosuits (Winter Thaw 2017) (#23320)

* Adds AI control beacons for exosuits

* Diagnostic HUD entry + Design Fix

- Adds Diagnostic HUD entries for mecha beacons. (Green for normal, Blue
for AI)
- Fixes AI beacon research designs to havep roper requirements

* Sanity checks for mech hijacking

code/modules/mob/living/living.dm

@@ -900,7 +900,7 @@
 //Mobs on Fire end
 
 // used by secbot and monkeys Crossed
-/mob/living/proc/knockOver(var/mob/living/carbon/C)	
+/mob/living/proc/knockOver(var/mob/living/carbon/C)
 	C.visible_message("<span class='warning'>[pick( \
 					  "[C] dives out of [src]'s way!", \
 					  "[C] stumbles over [src]!", \

code/modules/mob/living/silicon/ai/ai.dm

@@ -82,6 +82,8 @@ var/list/ai_list = list()
 
 	var/obj/machinery/camera/portable/builtInCamera
 
+	var/obj/structure/AIcore/deactivated/linked_core //For exosuit control
+
 /mob/living/silicon/ai/New(loc, datum/ai_laws/L, mob/target_ai)
 	..()
 	if(!target_ai) //If there is no player/brain inside.
@@ -419,7 +421,16 @@ var/list/ai_list = list()
 	if (href_list["ai_take_control"]) //Mech domination
 		var/obj/mecha/M = locate(href_list["ai_take_control"])
 		if(controlled_mech)
-			src << "You are already loaded into an onboard computer!"
+			src << "<span class='warning'>You are already loaded into an onboard computer!</span>"
+			return
+		if(!cameranet.checkCameraVis(M))
+			src << "<span class='warning'>Exosuit is no longer near active cameras.</span>"
+			return
+		if(lacks_power())
+			src << "<span class='warning'>You're depowered!</span>"
+			return
+		if(!isturf(loc))
+			src << "<span class='warning'>You aren't in your core!</span>"
 			return
 		if(M)
 			M.transfer_ai(AI_MECH_HACK,src, usr) //Called om the mech itself.

code/modules/research/designs/mechfabricator_designs.dm

@@ -728,6 +728,16 @@
 	construction_time = 50
 	category = list("Misc")
 
+/datum/design/mecha_tracking_ai_control
+	name = "AI Control Beacon"
+	id = "mecha_tracking_ai_control"
+	build_type = MECHFAB
+	build_path = /obj/item/mecha_parts/mecha_tracking/ai_control
+	materials = list(MAT_METAL = 1000, MAT_GLASS = 500, MAT_SILVER = 200)
+	req_tech = list("programming" = 3, "magnets" = 2, "engineering" = 2)
+	construction_time = 50
+	category = list("Misc")
+
 /datum/design/drone_shell
 	name = "Drone Shell"
 	desc = "A shell of a maintenance drone, an expendable robot built to perform station repairs."