Actual lockers (#195)

Adds storing entities into lockers the way we all know and love.
Relies on an implementation of ITileDefinition in https://github.com/space-wizards/space-station-14/pull/193 (just like origin/master)
#191

Content.Shared/Content.Shared.csproj

@@ -122,5 +122,6 @@
       <Name>Robust.Shared</Name>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
 </Project>

Content.Shared/GameObjects/Components/Storage/SharedStorageComponent.cs

@@ -7,7 +7,7 @@ namespace Content.Shared.GameObjects.Components.Storage
 {
     public abstract class SharedStorageComponent : Component
     {
-        public sealed override string Name => "Storage";
+        public override string Name => "Storage";
         public override uint? NetID => ContentNetIDs.INVENTORY;
         public override Type StateType => typeof(StorageComponentState);
 

Content.Shared/GameObjects/ContentNetIDs.cs

@@ -17,5 +17,6 @@
         public const uint SOUND = 1012;
         public const uint ITEM = 1013;
         public const uint CLOTHING = 1014;
+        public const uint ENTITYSTORAGE = 1015;
     }
 }

Content.Shared/Physics/CollisionGroup.cs

@@ -8,10 +8,10 @@ namespace Content.Shared.Physics
     [Flags]
     public enum CollisionGroup
     {
-        None = 0x0000,
-        Grid = 0x0001, // Walls
-        Mob = 0x0002, // Mobs, like the player or NPCs
-        Fixture = 0x0004, // wall fixtures, like APC or posters
-        Items = 0x008, // Items on the ground
+        None = 0,
+        Grid = 1, // Walls
+        Mob = 2, // Mobs, like the player or NPCs
+        Fixture = 4, // wall fixtures, like APC or posters
+        Items = 8 // Items on the ground
     }
 }