Add basic teleportation and portals (#269)

* Add basic teleportation and portals

* Address PJB's feedback and minor cleanup

Content.Server/GameObjects/Components/Movement/TeleportableComponent.cs

@@ -0,0 +1,10 @@
+using Robust.Shared.GameObjects;
+using Robust.Shared.Log;
+
+namespace Content.Server.GameObjects.Components.Movement
+{
+    public class TeleportableComponent : Component
+    {
+        public override string Name => "Teleportable";
+    }
+}