PORT: Allows Markings to Set Custom Layers for Specific Sprites (#2516)

* multilayer markings

* vestigial reptilian tail sprites added

* i fix :)

---------

Co-authored-by: mq <113324899+mqole@users.noreply.github.com>

Content.IntegrationTests/Tests/Sprite/ItemSpriteTest.cs

@@ -28,7 +28,11 @@ public sealed class PrototypeSaveTest
     {
         // The only prototypes that should get ignored are those that REQUIRE setup to get a sprite. At that point it is
         // the responsibility of the spawner to ensure that a valid sprite is set.
-        "VirtualItem"
+        "VirtualItem",
+        "MobGoblin", // imp edits - these four prototypes are species and do not receive their sprite data from ItemComponent, causing a false positive
+        "MobGoblinStowaway",
+        "MobGoblinKnight",
+        "MobGoblinCastaway",
     };
 
     [Test]