missing string include

src/lava-vr/BatchingRenderer.hh

 #pragma once
+
+#include <vector>
+#include <string>
+
 #include <glm/common.hpp>
 #include <glm/mat4x4.hpp>
+
 #include <lava/fwd.hh>
-#include <vector>
 
 namespace lava {
 namespace vr {