Add puddles / reagent spills (#743)

Content.Server/GameObjects/Components/Fluids/CanSpillComponent.cs

@@ -0,0 +1,47 @@
+using System;
+using Content.Server.GameObjects.Components.Chemistry;
+using Content.Shared.Chemistry;
+using Content.Shared.GameObjects;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Interfaces.GameObjects;
+
+namespace Content.Server.GameObjects.Components.Fluids
+{
+    [RegisterComponent]
+    public class CanSpillComponent : Component
+    {
+        public override string Name => "CanSpill";
+        // TODO: If the Owner doesn't have a SolutionComponent straight up just have this remove itself?
+
+        /// <summary>
+        ///     Transfers solution from the held container to the target container.
+        /// </summary>
+        [Verb]
+        private sealed class FillTargetVerb : Verb<CanSpillComponent>
+        {
+            protected override string GetText(IEntity user, CanSpillComponent component)
+            {
+                return "Spill liquid";
+            }
+
+            protected override VerbVisibility GetVisibility(IEntity user, CanSpillComponent component)
+            {
+                if (component.Owner.TryGetComponent(out SolutionComponent solutionComponent))
+                {
+                    return solutionComponent.CurrentVolume > ReagentUnit.Zero ? VerbVisibility.Visible : VerbVisibility.Disabled;
+                }
+
+                return VerbVisibility.Invisible;
+            }
+
+            protected override void Activate(IEntity user, CanSpillComponent component)
+            {
+                var solutionComponent = component.Owner.GetComponent<SolutionComponent>();
+                // Need this as when we split the component's owner may be deleted
+                var entityLocation = component.Owner.Transform.GridPosition;
+                var solution = solutionComponent.SplitSolution(solutionComponent.CurrentVolume);
+                SpillHelper.SpillAt(entityLocation, solution, "PuddleSmear");
+            }
+        }
+    }
+}