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/controllers/configuration/entries/game_options.dm

@@ -507,3 +507,9 @@
 
 //Allows players to set a hexadecimal color of their choice as skin tone, on top of the standard ones.
 /datum/config_entry/flag/allow_custom_skintones
+
+/**
+  * Enables the FoV component, which hides objects and mobs behind the parent from their sight, unless they turn around, duh.
+  * Camera mobs, AIs, ghosts and some other are of course exempt from this. This also doesn't influence simplemob AI, for the best.
+  */
+/datum/config_entry/flag/use_field_of_vision