message: Rename _ug to mIsUnderground
diff: @@ -22,17 +22,17 @@ public:
  void ug()
  {
  sprite().play(constants::STRUCTURE_STATE_OPERATIONAL_UG);
  - _ug = true;
  + mIsUnderground = true;
  }
  void forced_state_change(StructureState, DisabledReason, IdleReason) override
  {
  - if (_ug)
  + if (mIsUnderground)
  {
  return;
  }
  }
  private:
  - bool _ug = false;
  + bool mIsUnderground = false;
  };
  