Add buildable plastic flaps (#6583)

Co-authored-by: fishfish458 <fishfish458>

Resources/Prototypes/Recipes/Construction/Graphs/structures/plastic_flaps.yml

@@ -0,0 +1,26 @@
+- type: constructionGraph
+  id: PlasticFlapsGraph
+  start: start
+  graph:
+  - node: start
+    actions:
+      - !type:DestroyEntity {}
+    edges:
+      - to: plasticFlaps
+        completed:
+          - !type:SnapToGrid { }
+        steps:
+          - material: Plastic
+            amount: 5
+            doAfter: 10
+  - node: plasticFlaps
+    entity: PlasticFlapsClear
+    edges:
+      - to: start
+        completed:
+          - !type:SpawnPrototype
+            prototype: SheetPlastic
+            amount: 5
+        steps:
+          - tool: Anchoring
+            doAfter: 10

Resources/Prototypes/Recipes/Construction/structures.yml

@@ -450,7 +450,7 @@
   conditions:
   # Same here. - 20kdc
     - !type:TileNotBlocked
-    
+
 - type: construction
   name: ground light post
   id: LightGroundFixture
@@ -672,5 +672,20 @@
   icon:
     sprite: Structures/Doors/MineralDoors/paper_door.rsi
     state: closed
+
+- type: construction
+  name: airtight plastic flaps
+  id: PlasticFlapsClear
+  graph: PlasticFlapsGraph
+  startNode: start
+  targetNode: plasticFlaps
+  category: Structures
+  placementMode: SnapgridCenter
+  description: A plastic flap to let items through and keep people out.
+  objectType: Structure
+  canBuildInImpassable: false
+  icon:
+    sprite: Structures/plastic_flaps.rsi
+    state: plasticflaps
   conditions:
     - !type:TileNotBlocked