Stops idle syndicate mobs from destroying surroundings

Adds a variable ('idle_env_destroyer') to all hostile mobs, denoting
whether the mob destroys it's environment while idling or not. Default
value is 0 (no). Syndicate, russian and pirate mobs are affected. Also
prevents aforementioned mobs from suiciding and/or wrecking away mission
environments before the player could see them.

Fixes hostile mobs interpreting 'null' as a valid target and always
being in HOSTILE_ATTACK stance.

code/modules/mob/living/simple_animal/hostile/alien.dm

@@ -33,6 +33,7 @@
 	status_flags = CANPUSH
 	minbodytemp = 0
 	heat_damage_per_tick = 20
+	idle_env_destroyer = 1
 
 
 /mob/living/simple_animal/hostile/alien/drone

code/modules/mob/living/simple_animal/hostile/bear.dm

@@ -36,6 +36,7 @@
 	var/stance_step = 0
 
 	faction = "russian"
+	idle_env_destroyer = 1
 
 //SPACE BEARS! SQUEEEEEEEE~     OW! FUCK! IT BIT MY HAND OFF!!
 /mob/living/simple_animal/hostile/bear/Hudson

code/modules/mob/living/simple_animal/hostile/carp.dm

@@ -35,6 +35,7 @@
 	minbodytemp = 0
 
 	faction = "carp"
+	idle_env_destroyer = 1
 
 /mob/living/simple_animal/hostile/carp/Process_Spacemove(var/check_drift = 0)
 	return 1	//No drifting in space for space carp!	//original comments do not steal

code/modules/mob/living/simple_animal/hostile/creature.dm

@@ -12,3 +12,4 @@
 	attacktext = "chomps"
 	attack_sound = 'sound/weapons/bite.ogg'
 	faction = "creature"
+	idle_env_destroyer = 1

code/modules/mob/living/simple_animal/hostile/faithless.dm

@@ -30,6 +30,7 @@
 	minbodytemp = 0
 
 	faction = "faithless"
+	idle_env_destroyer = 1
 
 /mob/living/simple_animal/hostile/faithless/Process_Spacemove(var/check_drift = 0)
 	return 1

code/modules/mob/living/simple_animal/hostile/giant_spider.dm

@@ -33,6 +33,7 @@
 	var/busy = 0
 	pass_flags = PASSTABLE
 	move_to_delay = 6
+	idle_env_destroyer = 1
 
 //nursemaids - these create webs and eggs
 /mob/living/simple_animal/hostile/giant_spider/nurse

code/modules/mob/living/simple_animal/hostile/hivebot.dm

@@ -26,6 +26,7 @@
 	min_n2 = 0
 	max_n2 = 0
 	minbodytemp = 0
+	idle_env_destroyer = 1
 
 /mob/living/simple_animal/hostile/hivebot/range
 	name = "hivebot"

code/modules/mob/living/simple_animal/hostile/hostile.dm

@@ -11,6 +11,7 @@
 	var/move_to_delay = 2 //delay for the automated movement.
 	var/list/friends = list()
 	var/vision_range = 10
+	var/idle_env_destroyer = 0
 	stop_automated_movement_when_pulled = 0
 
 /mob/living/simple_animal/hostile/proc/FindTarget()
@@ -45,7 +46,8 @@
 
 /mob/living/simple_animal/hostile/proc/GiveTarget(var/new_target)
 	target = new_target
-	stance = HOSTILE_STANCE_ATTACK
+	if(target != null || src.idle_env_destroyer == 1)
+		stance = HOSTILE_STANCE_ATTACK
 	return
 
 /mob/living/simple_animal/hostile/proc/Goto(var/target, var/delay)

code/modules/mob/living/simple_animal/hostile/mimic.dm

@@ -35,6 +35,7 @@
 
 	faction = "mimic"
 	move_to_delay = 8
+	idle_env_destroyer = 1
 
 /mob/living/simple_animal/hostile/mimic/FindTarget()
 	. = ..()

code/modules/mob/living/simple_animal/hostile/pirate.dm

@@ -33,6 +33,7 @@
 	var/weapon1 = /obj/item/weapon/melee/energy/sword/pirate
 
 	faction = "pirate"
+	idle_env_destroyer = 0
 
 /mob/living/simple_animal/hostile/pirate/ranged
 	name = "Pirate Gunner"

code/modules/mob/living/simple_animal/hostile/retaliate/clown.dm

@@ -37,3 +37,4 @@
 	heat_damage_per_tick = 15	//amount of damage applied if animal's body temperature is higher than maxbodytemp
 	cold_damage_per_tick = 10	//same as heat_damage_per_tick, only if the bodytemperature it's lower than minbodytemp
 	unsuitable_atoms_damage = 10
+	idle_env_destroyer = 1

code/modules/mob/living/simple_animal/hostile/russian.dm

@@ -32,6 +32,7 @@
 	unsuitable_atoms_damage = 15
 	faction = "russian"
 	status_flags = CANPUSH
+	idle_env_destroyer = 0
 
 
 /mob/living/simple_animal/hostile/russian/ranged

code/modules/mob/living/simple_animal/hostile/syndicate.dm

@@ -34,6 +34,7 @@
 	wall_smash = 1
 	faction = "syndicate"
 	status_flags = CANPUSH
+	idle_env_destroyer = 0
 
 /mob/living/simple_animal/hostile/syndicate/Die()
 	..()

code/modules/mob/living/simple_animal/hostile/tree.dm

@@ -36,6 +36,7 @@
 	minbodytemp = 0
 
 	faction = "carp"
+	idle_env_destroyer = 1
 
 /mob/living/simple_animal/hostile/tree/FindTarget()
 	. = ..()