Fix blank animqueues, and add facing=math.auto to animate

luprex/cpp/core/world-core.cpp

@@ -234,12 +234,11 @@ void World::get_near(int64_t player_id, float radius, bool exclude_nowhere, bool
 }
 
 void World::get_encoded_animation_queues(uint32_t count, const int64_t *ids, util::SharedStdStringVec &into) {
-    util::SharedStdString empty = std::make_shared<std::string>("");
     into.resize(count);
     for (int i = 0; i < int(count); i++) {
         Tangible *tan = tangible_get(ids[i]);
         if (tan == nullptr) {
-            into[i] = empty;
+            into[i] = AnimQueue::get_encoded_blank_queue();
         } else {
             into[i] = tan->anim_queue_.get_encoded_queue();
         }
@@ -1191,6 +1190,7 @@ void World::rollback() {
 // 
 void engine_initialization() {
     SourceDB::register_lua_builtins();
+    AnimQueue::initialize_module();
 }
 
 static DrivenEngineInitializerReg eireg(engine_initialization);