Adds IThrown, ILand interfaces. Adds dice. (#273)

* Dice, IThrown, ILand

* Adds sounds to the dice using a sound collection.

* Seed random instance better.

* Missed a ")", should compile now

Content.Server/GameObjects/Components/Projectiles/ThrownItemComponent.cs

@@ -1,17 +1,29 @@
 using System.Collections.Generic;
 using Content.Server.GameObjects.Components.Projectiles;
+using Content.Server.GameObjects.EntitySystems;
 using Content.Shared.GameObjects;
 using Content.Shared.Physics;
 using Robust.Server.GameObjects;
+using Robust.Shared.GameObjects;
 using Robust.Shared.Interfaces.GameObjects;
 using Robust.Shared.Interfaces.GameObjects.Components;
+using Robust.Shared.IoC;
 
 namespace Content.Server.GameObjects.Components
 {
     class ThrownItemComponent : ProjectileComponent, ICollideBehavior
     {
+#pragma warning disable 649
+        [Dependency] private readonly IEntitySystemManager _entitySystemManager;
+#pragma warning restore 649
+
         public override string Name => "ThrownItem";
 
+        /// <summary>
+        ///     User who threw the item.
+        /// </summary>
+        public IEntity User;
+
         void ICollideBehavior.CollideWith(List<IEntity> collidedwith)
         {
             foreach (var entity in collidedwith)
@@ -31,9 +43,13 @@ namespace Content.Server.GameObjects.Components
                 body.CollisionMask &= (int)~CollisionGroup.Mob;
                 body.IsScrapingFloor = true;
 
-                // KYS, your job is finished.
+                // KYS, your job is finished. Trigger ILand as well.
                 Owner.RemoveComponent<ThrownItemComponent>();
+                _entitySystemManager.GetEntitySystem<InteractionSystem>().LandInteraction(User, Owner, Owner.Transform.GridPosition);
             }
+
+
+
         }
     }
 }