Add ability to burn papers +Flammable tweaks. (#18955)

Resources/Prototypes/Entities/Objects/Misc/paper.yml

@@ -30,6 +30,32 @@
     - Trash
   - type: Appearance
   - type: PaperVisuals
+  - type: Flammable
+    fireSpread: true
+    canResistFire: false
+    alwaysCombustible: true
+    canExtinguish: false # Mwahaha! Let the world burn because of one piece of paper!
+    damage:
+      types:
+        Heat: 1
+  - type: FireVisuals
+    sprite: Effects/fire.rsi
+    normalState: fire
+  - type: Damageable
+    damageModifierSet: Wood
+  - type: Destructible
+    thresholds:
+    - trigger:
+        !type:DamageTrigger
+        damage: 15
+      behaviors:
+      - !type:SpawnEntitiesBehavior
+        spawn:
+            Ash:
+              min: 1
+              max: 1
+      - !type:DoActsBehavior
+        acts: [ "Destruction" ]
 
 - type: entity
   name: office paper