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/__HELPERS/game.dm

@@ -249,6 +249,15 @@
 			SEND_SIGNAL(A, COMSIG_ATOM_HEARER_IN_VIEW, processing, .)
 		processing += A.contents
 
+//viewers() but with a signal, for blacklisting.
+/proc/get_actual_viewers(depth = world.view, atom/center)
+	if(!center)
+		return
+	. = viewers(depth, center)
+	for(var/k in .)
+		var/mob/M = k
+		SEND_SIGNAL(M, COMSIG_MOB_IS_VIEWER, center, depth, .)
+
 /proc/get_mobs_in_radio_ranges(list/obj/item/radio/radios)
 	. = list()
 	// Returns a list of mobs who can hear any of the radios given in @radios

code/__HELPERS/unsorted.dm

@@ -1,5 +1,3 @@
-
-
 /*
  * A large number of misc global procs.
  */
@@ -391,6 +389,16 @@ Turf and target are separate in case you want to teleport some distance from a t
 			break
 	return loc
 
+//Returns a list of all locations the target is within.
+/proc/get_nested_locs(atom/movable/M, include_turf = FALSE)
+	. = list()
+	var/atom/A = M.loc
+	while(A && !isturf(A))
+		. += A
+		A = A.loc
+	if(A && include_turf) //At this point, only the turf is left.
+		. += A
+
 // returns the turf located at the map edge in the specified direction relative to A
 // used for mass driver
 /proc/get_edge_target_turf(atom/A, direction)