Port Bay-style attack animations (#4827)

* POLARIS: Attack animations

* POLARIS: Overlay flick system

You can't do this in Byond, unfortunately, so here's some code from /tg/

* Make attack anims a preference

code/modules/client/preference_setup/global/setting_datums.dm

@@ -98,6 +98,12 @@ var/list/_client_preferences_by_type
 	enabled_description = "Show"
 	disabled_description = "Hide"
 
+/datum/client_preference/attack_icons
+	description ="Attack icons"
+	key = "ATTACK_ICONS"
+	enabled_description = "Show"
+	disabled_description = "Hide"
+
 /datum/client_preference/show_typing_indicator
 	description ="Typing indicator"
 	key = "SHOW_TYPING"