message: * KHR_lights_punctual: intensity light default to 1
  fix: when loading a gltf with KHR_lights_punctual extension with lights with no intensity (default 1), the gltf was saved with intensity 0 instead of 1
diff: @@ -4737,6 +4737,8 @@ static int cgltf_parse_json_light(cgltf_options* options, jsmntok_t const* token
  {
  CGLTF_CHECK_TOKTYPE(tokens[i], JSMN_OBJECT);
  + out_light->intensity = 1.f;
  +
  int size = tokens[i].size;
  ++i;
  