Scope various unscoped locate() calls (#42195)

* Scope locate calls which are immediately checked against a list

* Remove silly use of locate from bible Topic

* Scope various locate calls (needs testing)

* More WIP

* Buff up lightswitches while we're here

* Tidy record browsing code

* Scope a few more locates

These have caused problems in the past (#41917, #39303). Continues #29349.

Also cleans up lightswitch code while I was already touching it.

I recommend a testmerge.

code/modules/mob/living/carbon/human/species_types/jellypeople.dm

@@ -330,7 +330,8 @@
 		return
 	switch(action)
 		if("swap")
-			var/mob/living/carbon/human/selected = locate(params["ref"])
+			var/datum/species/jelly/slime/SS = H.dna.species
+			var/mob/living/carbon/human/selected = locate(params["ref"]) in SS.bodies
 			if(!can_swap(selected))
 				return
 			SStgui.close_uis(src)

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

@@ -349,7 +349,7 @@
 		unset_machine()
 		src << browse(null, t1)
 	if (href_list["switchcamera"])
-		switchCamera(locate(href_list["switchcamera"])) in GLOB.cameranet.cameras
+		switchCamera(locate(href_list["switchcamera"]) in GLOB.cameranet.cameras)
 	if (href_list["showalerts"])
 		ai_alerts()
 #ifdef AI_VOX
@@ -362,7 +362,7 @@
 			src << browse(last_paper_seen, "window=show_paper")
 	//Carn: holopad requests
 	if(href_list["jumptoholopad"])
-		var/obj/machinery/holopad/H = locate(href_list["jumptoholopad"])
+		var/obj/machinery/holopad/H = locate(href_list["jumptoholopad"]) in GLOB.machines
 		if(H)
 			H.attack_ai(src) //may as well recycle
 		else
@@ -404,7 +404,7 @@
 		return
 
 	if (href_list["ai_take_control"]) //Mech domination
-		var/obj/mecha/M = locate(href_list["ai_take_control"])
+		var/obj/mecha/M = locate(href_list["ai_take_control"]) in GLOB.mechas_list
 		if (!M)
 			return
 

code/modules/mob/living/silicon/pai/software.dm

@@ -214,7 +214,7 @@
 					if(silent)
 						return alert("Communications circuits remain uninitialized.")
 
-					var/target = locate(href_list["target"])
+					var/target = locate(href_list["target"]) in GLOB.PDAs
 					pda.create_message(src, target)
 
 		// Accessing medical records