Implement native object models (#68)

crates/libremetaverse/src/current_outfit.rs

@@ -1166,6 +1166,7 @@ pub(crate) fn primitive_defaults() -> Primitive {
         },
         textures: None,
         tree_species: crate::Tree::Pine1,
+        unknown_extra_params: Vec::new(),
         velocity: libremetaverse_types::Vector3::zero(),
     }
 }