Change how animstate is accessed

luprex/core/cpp/animqueue.hpp

@@ -117,9 +117,7 @@ public:
     void add(int64_t id, lua_State *L, int idx);
 
     // Get the final resting place after all animations are complete.
-    const std::string &get_graphic() const;
-    const std::string &get_plane() const;
-    const util::XYZ &get_xyz() const;
+    const AnimStep &back() const;
 
     // (For testing): change the size limit.
     void set_size_limit(int32_t n);