Chemical implants can be synced with a remote signalling device(and also work at all) (#95520)

## About The Pull Request

Allows one to sync a remote chemical implant with a remote signalling
device, which disables its control via the Prisoner Management Console,
as well as its automatic injection upon death, & replaces it with
control via signal. The signal immediately injects all of the implant's
chemicals.

Also fixes that these things can't be moved out of the implant case at
all.

## Why It's Good For The Game

Currently, chem implants are only activateable via security's Prisoner
Management Console, and are visible(and destructible) through any of
those consoles. This limits their ability to be an antagonistic threat,
as it is only controllable via a crew-accessible console. Additionally,
this console is not capable of being controlled via other automatic
means, unlike radio signals, which expands their possible use cases
considerably. The threat of the implant could be interesting for an
antagonist to be able to use.

Also, nice that they're usable again.

## Changelog
🆑

add: Remote chemical implants can be synced with a remote signalling
device to activate without a Prisoner Management Console.

/🆑

code/game/objects/items/implants/implant.dm

@@ -6,7 +6,7 @@
 	icon = 'icons/hud/implants.dmi'
 	icon_state = "generic" //Shows up as the action button icon
 	item_flags = ABSTRACT | DROPDEL
-	resistance_flags = INDESTRUCTIBLE
+	resistance_flags = INDESTRUCTIBLE | UNACIDABLE
 	// This gives the user an action button that allows them to activate the implant.
 	// If the implant needs no action button, then null this out.
 	// Or, if you want to add a unique action button, then replace this.

code/game/objects/items/implants/security/implant_chem.dm

@@ -7,9 +7,14 @@
 	hud_icon_state = "hud_imp_chem"
 	/// All possible injection sizes for the implant shown in the prisoner management console.
 	var/list/implant_sizes = list(1, 5, 10)
+	/// Frequency of radio signal we've been synced to
+	var/frequency
+	/// Code of radio signal we've been synced to
+	var/code
+
 
 	implant_info = "Requires filling via syringe while in an implant case. Automatically activates upon implantation. \
-		Allows for remote release of reagents directly into implantee's bloodstream."
+		Allows for remote release of reagents directly into implantee's bloodstream. Can be synced with a remote signalling device."
 
 	implant_lore = "The Robust Corp MJ-420 Remote Chemical Release Implant is a remotely-controlled \
 		microcapsule network designed to be filled via syringe while still within an implant case. After implantation, \
@@ -19,7 +24,7 @@
 		into their bloodstream."
 
 /obj/item/implant/chem/is_shown_on_console(obj/machinery/computer/prisoner/management/console)
-	return is_valid_z_level(get_turf(console), get_turf(imp_in))
+	return !frequency && is_valid_z_level(get_turf(console), get_turf(imp_in))
 
 /obj/item/implant/chem/get_management_console_data()
 	var/list/info_shown = ..()
@@ -58,7 +63,7 @@
 
 /obj/item/implant/chem/implant(mob/living/target, mob/user, silent = FALSE, force = FALSE)
 	. = ..()
-	if(.)
+	if(. && !frequency)
 		RegisterSignal(target, COMSIG_LIVING_DEATH, PROC_REF(on_death))
 
 /obj/item/implant/chem/removed(mob/target, silent = FALSE, special = FALSE)
@@ -86,13 +91,25 @@
 		to_chat(R, span_hear("You hear a faint click from your chest."))
 		qdel(src)
 
+/obj/item/implant/chem/item_interaction(mob/living/user, obj/item/tool, list/modifiers)
+	if(istype(tool, /obj/item/assembly/signaler))
+		signaler_sync(tool, user)
+		return ITEM_INTERACT_SUCCESS
+	return ..()
+
+/obj/item/implant/chem/proc/signaler_sync(obj/item/assembly/signaler/syncing_signaler, mob/living/user)
+	to_chat(user, "You sync \the [src] to \the [syncing_signaler]'s code & frequency[frequency ? "" : ", disabling other methods of activation"].")
+	code = syncing_signaler.code
+	SSradio.remove_object(src, frequency)
+	frequency = syncing_signaler.frequency
+	SSradio.add_object(src, frequency, RADIO_SIGNALER)
+
+/obj/item/implant/chem/receive_signal(datum/signal/signal)
+	if(!signal || signal.data["code"] != code)
+		return
+	activate(reagents.total_volume)
 
 /obj/item/implantcase/chem
 	name = "implant case - 'Remote Chemical'"
 	desc = "A glass case containing a remote chemical implant."
 	imp_type = /obj/item/implant/chem
-
-/obj/item/implantcase/chem/item_interaction(mob/living/user, obj/item/tool, list/modifiers)
-	if(!istype(tool, /obj/item/reagent_containers/syringe) && imp)
-		return NONE
-	return tool.interact_with_atom(imp, user, modifiers)