Default-construct components for created entities in util::ecs

libs/util/include/psemek/util/ecs.hpp

@@ -219,6 +219,9 @@ namespace psemek::util
 				}
 
 				auto result = list_head_;
+
+				((std::get<I>(entity_components_)[result] = {}), ...);
+
 				list_head_ = list_[list_head_];
 				list_[result] = result;
 				entity_count_++;