Adds Roach Infusion to the DNA infuser (#76393)

## About The Pull Request

- Adds Roach Infusion to the DNA infuser. 
   - Bonuses include:
- All infused organs are 2x as healthy, notably your heart: Meaning
getting revived after being dead a while is easier
- When being attacked from behind or while lying down, take 50% less
damage from brute attacks
      - Lose disgust 32x faster, making it a non-issue
      - Higher toxin purge threshold (5 units, up from 3)
      - Virus resistance (same as spaceacillin)
      - 100 innate bomb armor, preventing explosions from gibbing you
      - 90 innate bio armor
- Immunity to appendicitis, radiation, and to being gibbed by nuclear
bombs
   - Downsides include:
      - Knockdowns are 3x as long
      - get 3x as hungry
      - Ingest reagents to your stomach 1.5x slower
      - Take 2x as much damage from toxins
- Toxins over the purge threshold deal 4x more liver damage (effectively
2x, as the liver has 2x health)
      - Becoming a bug
      - Roaches are gross

- Adds a way to kill roaches without having them splat. If they are
sprayed with bug spray, they will simply fall over, and can be scooped
up.


https://github.com/tgstation/tgstation/assets/51863163/5078c493-9e28-42cb-ae51-45fa25b67a34

## Why It's Good For The Game

More content for the DNA infuser, which benefits greatly from variety. 

While initially it may seem like a lot of bonuses, a lot of them are
very niche, with the exception being the brute resilience which is the
big "actually useful" bonus you gain.

The infusion is intended to be given to Engineers, offering innate
Radiation immunity to allow them to work on the Supermatter without
needing a rad suit. Likewise, if the work goes south and the Supermatter
goes boom, their body will more than likely survive the blast.

## Changelog

🆑 Melbert
add: Adds the Roach infusion to the DNA infuser. Do you want to survive
a nuclear apocalypse? Visit genetics today.
add: Adds a way to kill Roaches without splatting them. Visit botany for
a spray bottle of pestkiller.
qol: Infuser book is more book-like
fix: DNA infuser correctly gives on-success feedback messages
/🆑

---------

Co-authored-by: Jacquerel <hnevard@gmail.com>

code/modules/mob/living/basic/vermin/cockroach.dm

@@ -2,13 +2,15 @@
 	name = "cockroach"
 	desc = "This station is just crawling with bugs."
 	icon_state = "cockroach"
-	icon_dead = "cockroach" //Make this work
+	icon_dead = "cockroach_no_animation"
 	density = FALSE
 	mob_biotypes = MOB_ORGANIC|MOB_BUG
 	mob_size = MOB_SIZE_TINY
+	held_w_class = WEIGHT_CLASS_TINY
 	health = 1
 	maxHealth = 1
 	speed = 1.25
+	can_be_held = TRUE
 	gold_core_spawnable = FRIENDLY_SPAWN
 	pass_flags = PASSTABLE | PASSGRILLE | PASSMOB
 
@@ -38,17 +40,23 @@
 	var/static/list/roach_drops = list(/obj/effect/decal/cleanable/insectguts)
 	AddElement(/datum/element/death_drops, roach_drops)
 	AddElement(/datum/element/swabable, cockroach_cell_line, CELL_VIRUS_TABLE_GENERIC_MOB, 1, 7)
-	AddComponent(/datum/component/squashable, squash_chance = 50, squash_damage = 1)
+	AddElement(/datum/element/basic_body_temp_sensitive, 270, INFINITY)
+	AddComponent( \
+		/datum/component/squashable, \
+		squash_chance = 50, \
+		squash_damage = 1, \
+		squash_flags = SQUASHED_SHOULD_BE_GIBBED|SQUASHED_ALWAYS_IF_DEAD|SQUASHED_DONT_SQUASH_IN_CONTENTS, \
+	)
 	ADD_TRAIT(src, TRAIT_VENTCRAWLER_ALWAYS, INNATE_TRAIT)
-
-/mob/living/basic/cockroach/death(gibbed)
-	if(GLOB.station_was_nuked) //If the nuke is going off, then cockroaches are invincible. Keeps the nuke from killing them, cause cockroaches are immune to nukes.
-		return
-	return ..()
+	ADD_TRAIT(src, TRAIT_NUKEIMMUNE, INNATE_TRAIT)
+	ADD_TRAIT(src, TRAIT_RADIMMUNE, INNATE_TRAIT)
 
 /mob/living/basic/cockroach/ex_act() //Explosions are a terrible way to handle a cockroach.
 	return FALSE
 
+// Roach goop is the gibs to drop
+/mob/living/basic/cockroach/spawn_gibs()
+	return
 
 /datum/ai_controller/basic_controller/cockroach
 	blackboard = list(
@@ -125,7 +133,13 @@
 /mob/living/basic/cockroach/hauberoach/Initialize(mapload)
 	. = ..()
 	AddComponent(/datum/component/caltrop, min_damage = 10, max_damage = 15, flags = (CALTROP_BYPASS_SHOES | CALTROP_SILENT))
-	AddComponent(/datum/component/squashable, squash_chance = 100, squash_damage = 1, squash_callback = TYPE_PROC_REF(/mob/living/basic/cockroach/hauberoach, on_squish))
+	AddComponent( \
+		/datum/component/squashable, \
+		squash_chance = 100, \
+		squash_damage = 1, \
+		squash_flags = SQUASHED_SHOULD_BE_GIBBED|SQUASHED_ALWAYS_IF_DEAD|SQUASHED_DONT_SQUASH_IN_CONTENTS, \
+		squash_callback = TYPE_PROC_REF(/mob/living/basic/cockroach/hauberoach, on_squish), \
+	)
 
 ///Proc used to override the squashing behavior of the normal cockroach.
 /mob/living/basic/cockroach/hauberoach/proc/on_squish(mob/living/cockroach, mob/living/living_target)
@@ -136,6 +150,7 @@
 		return TRUE
 	living_target.visible_message(span_notice("[living_target] squashes [cockroach], not even noticing its spike."), span_notice("You squashed [cockroach], not even noticing its spike."))
 	return FALSE
+
 /datum/ai_controller/basic_controller/cockroach/hauberoach
 	planning_subtrees = list(
 		/datum/ai_planning_subtree/pet_planning,