Add backpack bombing (#1156)

* Change exploding storages to explode their contents as well

* Change storages to only trigger content explosions when the severity is heavy or destruction

* Make inventories explode their contents as well

* Change InventoryComponent IExAct into an explicit implementation

* Change chain explosions to only trigger for explosion severities larger than or equal to heavy

Content.Server/GameObjects/Components/Items/Storage/ServerStorageComponent.cs

@@ -32,7 +32,7 @@ namespace Content.Server.GameObjects
     [RegisterComponent]
     [ComponentReference(typeof(IActivate))]
     [ComponentReference(typeof(IStorageComponent))]
-    public class ServerStorageComponent : SharedStorageComponent, IInteractUsing, IUse, IActivate, IStorageComponent, IDestroyAct
+    public class ServerStorageComponent : SharedStorageComponent, IInteractUsing, IUse, IActivate, IStorageComponent, IDestroyAct, IExAct
     {
 #pragma warning disable 649
         [Dependency] private readonly IMapManager _mapManager;
@@ -364,6 +364,24 @@ namespace Content.Server.GameObjects
             }
         }
 
+        void IExAct.OnExplosion(ExplosionEventArgs eventArgs)
+        {
+            if (eventArgs.Severity < ExplosionSeverity.Heavy)
+            {
+                return;
+            }
+
+            var storedEntities = storage.ContainedEntities.ToList();
+            foreach (var entity in storedEntities)
+            {
+                var exActs = entity.GetAllComponents<IExAct>();
+                foreach (var exAct in exActs)
+                {
+                    exAct.OnExplosion(eventArgs);
+                }
+            }
+        }
+
         /// <summary>
         /// Inserts an entity into the storage component from the players active hand.
         /// </summary>