New CAS Weapon: BLU-200 Dragons Breath, thermobaric bomb (#3832)

# About the pull request

Adds a crowd control option to CAS missile options, to help incentivize
people away from CAS Metabuilds.

- Fire equivalent of the Banshee but without the impact damage.
- Implosion from fuel-air bomb pulls nearby units towards the center.
- 500 points (Expensive)

# Explain why it's good for the game

Missiles on CAS are super expensive and rarely make their points back.
In order to give the missile rack some punch and give it capabilities
the other higher damage weapons dont have, we give it a bit of CC.


# Testing Photographs and Procedure
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<summary>Screenshots & Videos</summary>

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screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
add: Added new CAS Missile: BLU-200 Dragons Breath
/:cl:

code/modules/cm_marines/dropship_ammo.dm

@@ -347,6 +347,21 @@
 	addtimer(CALLBACK(GLOBAL_PROC, GLOBAL_PROC_REF(fire_spread), impact, create_cause_data(initial(name), source_mob), 6, 60, 30, "#EE6515"), 0.5 SECONDS) //Color changed into napalm's color to better convey how intense the fire actually is.
 	QDEL_IN(src, 0.5 SECONDS)
 
+/obj/structure/ship_ammo/rocket/thermobaric
+	name = "\improper BLU-200 'Dragons Breath'"
+	desc = "The BLU-200 Dragons Breath a thermobaric fuel-air bomb. The aerosolized fuel mixture creates a vacuum when ignited causing serious damage to those in its way."
+	icon_state = "fatty"
+	ammo_id = "f"
+	travelling_time = 50
+	point_cost = 300
+	fire_mission_delay = 4
+
+/obj/structure/ship_ammo/rocket/thermobaric/detonate_on(turf/impact)
+	impact.ceiling_debris_check(3)
+	addtimer(CALLBACK(GLOBAL_PROC, GLOBAL_PROC_REF(fire_spread), impact, create_cause_data(initial(name), source_mob), 4, 25, 50, "#c96500"), 0.5 SECONDS) //Very intense but the fire doesn't last very long
+	for(var/mob/living/carbon/victim in orange(5, impact))
+		victim.throw_atom(impact, 3, 15, src, TRUE) // Implosion throws affected towards center of vacuum
+	QDEL_IN(src, 0.5 SECONDS)
 
 
 //minirockets