Adds cow milking (#5293)

Resources/Locale/en-US/animals/udder/udder-system.ftl

@@ -0,0 +1,7 @@
+### Udder system
+
+udder-system-already-milking = The udder is already being milked.
+udder-system-success = You fill {THE($target)} with {$amount}u from the udder.
+udder-system-dry = The udder is dry.
+
+udder-system-verb-milk = Milk

Resources/Prototypes/Entities/Mobs/NPCs/animals.yml

@@ -177,6 +177,18 @@
       normal: cow
       crit: dead
       dead: dead
+  - type: SolutionContainerManager
+    solutions:
+      udder:
+        maxVol: 250
+        reagents:
+        - ReagentId: Milk
+          Quantity: 30
+  - type: Udder
+    reagentId: Milk
+    targetSolution: udder
+    quantity: 25
+    updateRate: 30
 
 - type: entity
   name: crab