Field of Vision component. (#12075)

* Hopeless WIP for vision cones.

* Core component and hooks done

* Removing clutter.

* linter bashing me for using statements as args.

* Ok.

* continue

* bring back the macro

* Configs and openspace filter.

* Chat plane, reset perspective signal, mechs/vehicles cases, machineries.

* view, viewers and spoopy ghosts.

* Renamed component, admin fun button and snowflakes robots.

* Whoopsie.

* Yikes

* test merge tweak.

* radial yaketi sax.

* Fixed tgui UIs, some messages not displayed to the target.

* Documentation and a little bugfix.

* Pulling QoL, seventh plane made in this PR.

* Fix.

* Tweaks and improvements.

* Update randomverbs.dm

code/modules/reagents/chemistry/holder.dm

@@ -535,7 +535,7 @@
 					add_reagent(P, cached_results[P]*multiplier, null, chem_temp)
 
 
-				var/list/seen = viewers(4, get_turf(my_atom))//Sound and sight checkers
+				var/list/seen = get_actual_viewers(4, get_turf(my_atom))//Sound and sight checkers
 				var/iconhtml = icon2html(cached_my_atom, seen)
 				if(cached_my_atom)
 					if(!ismob(cached_my_atom)) // No bubbling mobs
@@ -617,10 +617,7 @@
 	handle_reactions()
 	update_total()
 	//Reaction sounds and words
-	var/list/seen = viewers(5, get_turf(my_atom))
-	var/iconhtml = icon2html(my_atom, seen)
-	for(var/mob/M in seen)
-		to_chat(M, "<span class='notice'>[iconhtml] [C.mix_message]</span>")
+	my_atom.visible_message("<span class='notice'>[icon2html(my_atom, viewers(DEFAULT_MESSAGE_RANGE, src))] [C.mix_message]</span>")
 
 /datum/reagents/proc/fermiReact(selected_reaction, cached_temp, cached_pH, reactedVol, targetVol, cached_required_reagents, cached_results, multiplier)
 	var/datum/chemical_reaction/C = selected_reaction