Crowbar floor tiles and placement (#429)

* Adds tile removing behavior to CrowbarComponent.
Add FloorTileItemComponent.
Add genhit.ogg
Add tile.png for testing

* fixes

* Gives ContentTileDefinition a default value for tile item to drop.
Adds a few more tileitems.

* Changes per review request

* move stack.use and if statement

Content.Server/GameObjects/Components/Interactable/Tools/CrowbarComponent.cs

@@ -42,6 +42,10 @@ namespace Content.Server.GameObjects.Components.Interactable.Tools
                 var underplating = _tileDefinitionManager["underplating"];
                 mapGrid.SetTile(eventArgs.ClickLocation, new Tile(underplating.TileId));
                _entitySystemManager.GetEntitySystem<AudioSystem>().Play("/Audio/items/crowbar.ogg", Owner);
+                //Actually spawn the relevant tile item at the right position and give it some offset to the corner.
+                var tileItem = Owner.EntityManager.SpawnEntity(tileDef.ItemDropPrototypeName);
+                tileItem.Transform.GridPosition = coordinates;
+                tileItem.Transform.WorldPosition += (0.2f, 0.2f);
             }
         }
     }