Exosuit Expansion: Return of the Ripley (#6767)

* Expands further upon Exosuits.

* FixFix Inflatable Deployer

* Changelog, fix oversights.

* Burst.

* Default 0

code/modules/mob/_modifiers/fire.dm

@@ -0,0 +1,36 @@
+// Ignition, but confined to the modifier system.
+// This makes it more predictable and thus, easier to balance.
+/datum/modifier/fire
+	name = "on fire"
+	desc = "You are on fire! You will be harmed until the fire goes out or you extinguish it with water."
+	mob_overlay_state = "on_fire"
+
+	on_created_text = "<span class='danger'>You burst into flames!</span>"
+	on_expired_text = "<span class='warning'>The fire starts to fade.</span>"
+	stacks = MODIFIER_STACK_ALLOWED // Multiple instances will hurt a lot.
+	var/damage_per_tick = 5
+
+/datum/modifier/fire/intense
+	mob_overlay_state = "on_fire_intense"
+	damage_per_tick = 10
+
+/datum/modifier/fire/tick()
+	holder.inflict_heat_damage(damage_per_tick)
+
+/*
+ * Modifier used by projectiles, like the flamethrower, that rely heavily on fire_stacks to persist.
+ */
+
+/datum/modifier/fire/stack_managed/tick()
+	..()
+
+	if(!holder.fire_stacks || holder.fire_stacks < 0)
+		if(prob(10))
+			expire()
+
+	else if(holder.fire_stacks > 0)
+		holder.fire_stacks -= 1
+
+/datum/modifier/fire/stack_managed/intense
+	mob_overlay_state = "on_fire_intense"
+	damage_per_tick = 10