Removes watcher overwatch ability (#78292)

## About The Pull Request

Removes the "overwatch" ability from Watchers, allowing them to use
their "look away" ability at any health threshold instead (but only if
it's been fighting you for at least 5 seconds or if you attack it).
Drops the cooldown on the gaze a little bit to compensate.

Also fixes some weird behaviour I noticed while testing:
- It won't cancel its own ability by trying to back away from you.
- It will look at you when it shoots you.

## Why It's Good For The Game

I was cooking too hard with this one.
- Two abilities overcomplicates what are supposed to be a pretty simple
mob you fight in packs.
- It wasn't obvious what you were actually supposed to do when
targetted.
- Doing it wrong could be very punishing in groups.
- Doing it _right_ was still kind of unexciting.

This is an ability to give to an elite, not a random trash mob.

## Changelog

🆑
balance: Watchers will no longer put you at gunpoint.
/🆑

code/modules/mob/living/basic/lavaland/watcher/watcher.dm

@@ -1,4 +1,4 @@
-/// A floating eyeball which keeps its distance and plays red light/green light with you.
+/// A floating eyeball which keeps its distance and sometimes make you look away.
 /mob/living/basic/mining/watcher
 	name = "watcher"
 	desc = "A levitating, monocular creature held aloft by wing-like veins. A sharp spine of crystal protrudes from its body."
@@ -59,14 +59,10 @@
 	)
 	update_appearance(UPDATE_OVERLAYS)
 
-	var/datum/action/cooldown/mob_cooldown/watcher_overwatch/overwatch = new(src)
-	overwatch.Grant(src)
-	overwatch.projectile_type = projectile_type
-	ai_controller.set_blackboard_key(BB_WATCHER_OVERWATCH, overwatch)
-
 	var/datum/action/cooldown/mob_cooldown/watcher_gaze/gaze = new gaze_attack(src)
 	gaze.Grant(src)
-	ai_controller.set_blackboard_key(BB_WATCHER_GAZE, gaze)
+	ai_controller.set_blackboard_key(BB_GENERIC_ACTION, gaze)
+	AddComponent(/datum/component/revenge_ability, gaze, targetting = ai_controller.blackboard[BB_TARGETTING_DATUM])
 
 /mob/living/basic/mining/watcher/update_overlays()
 	. = ..()

code/modules/mob/living/basic/lavaland/watcher/watcher_ai.dm

@@ -9,38 +9,20 @@
 		/datum/ai_planning_subtree/target_retaliate,
 		/datum/ai_planning_subtree/simple_find_target,
 		/datum/ai_planning_subtree/use_mob_ability/gaze,
-		/datum/ai_planning_subtree/targeted_mob_ability/overwatch,
 		/datum/ai_planning_subtree/ranged_skirmish/watcher,
 		/datum/ai_planning_subtree/maintain_distance,
 	)
 
-/datum/ai_planning_subtree/targeted_mob_ability/overwatch
-	ability_key = BB_WATCHER_OVERWATCH
-	operational_datums = list(/datum/component/ai_target_timer)
-
-/datum/ai_planning_subtree/targeted_mob_ability/overwatch/SelectBehaviors(datum/ai_controller/controller, seconds_per_tick)
-	var/mob/living/living_pawn = controller.pawn
-	if (living_pawn.do_after_count())
-		return // Don't interrupt our other ability
-	var/atom/target = controller.blackboard[target_key]
-	if (QDELETED(target) || HAS_TRAIT(target, TRAIT_OVERWATCH_IMMUNE))
-		return // We should probably let miners move sometimes
-	var/time_on_target = controller.blackboard[BB_BASIC_MOB_HAS_TARGET_TIME] || 0
-	if (time_on_target < 5 SECONDS)
-		return // We need to spend some time acquiring our target first
-	return ..()
-
 /datum/ai_planning_subtree/use_mob_ability/gaze
-	ability_key = BB_WATCHER_GAZE
 	finish_planning = TRUE
 
 /datum/ai_planning_subtree/use_mob_ability/gaze/SelectBehaviors(datum/ai_controller/controller, seconds_per_tick)
-	var/mob/living/watcher = controller.pawn
-	if (watcher.health > watcher.maxHealth * 0.66) // When we're a little hurt
-		return
 	var/mob/living/target = controller.blackboard[BB_BASIC_MOB_CURRENT_TARGET]
 	if (!isliving(target))
 		return // Don't do this if there's nothing hostile around or if our target is a mech
+	var/time_on_target = controller.blackboard[BB_BASIC_MOB_HAS_TARGET_TIME] || 0
+	if (time_on_target < 5 SECONDS)
+		return // We need to spend some time acquiring our target first
 	return ..()
 
 /datum/ai_planning_subtree/ranged_skirmish/watcher

code/modules/mob/living/basic/lavaland/watcher/watcher_gaze.dm

@@ -8,7 +8,7 @@
 	button_icon_state = "gaze"
 	background_icon_state = "bg_demon"
 	overlay_icon_state = "bg_demon_border"
-	cooldown_time = 30 SECONDS
+	cooldown_time = 20 SECONDS
 	check_flags = AB_CHECK_CONSCIOUS | AB_CHECK_INCAPACITATED
 	click_to_activate = FALSE
 	shared_cooldown = NONE

code/modules/mob/living/basic/lavaland/watcher/watcher_overwatch.dm

@@ -1,5 +1,6 @@
 /**
  * Automatically shoot at a target if they do anything while this is active on them.
+ * Currently not given to any mob, but retained so admins can use it.
  */
 /datum/action/cooldown/mob_cooldown/watcher_overwatch
 	name = "Overwatch"