message: Make MINE_DEPTH a const local
diff: @@ -24,7 +24,6 @@ static int RARE_METALS_ORE_POSITION;
  static int RARE_MINERALS_ORE_POSITION;
  static std::string MINE_YIELD;
  -static std::string MINE_DEPTH;
  static Font* FONT = nullptr;
  static Font* FONT_BOLD = nullptr;
  @@ -133,7 +132,6 @@ void MineOperationsWindow::mineFacility(MineFacility* facility)
  if (!mFacility) { return; }
  MINE_YIELD = MINE_YIELD_TRANSLATION[mFacility->mine()->productionRate()];
  - MINE_DEPTH = std::to_string(mFacility->mine()->depth());
  chkCommonMetals.checked(mFacility->mine()->miningCommonMetals());
  chkCommonMinerals.checked(mFacility->mine()->miningCommonMinerals());
  @@ -155,8 +153,6 @@ void MineOperationsWindow::updateCounts()
  {
  if (!visible() && !mFacility) { return; }
  - MINE_DEPTH = std::to_string(mFacility->mine()->depth());
  -
  COMMON_METALS_COUNT = std::to_string(mFacility->mine()->commonMetalsAvailable());
  COMMON_MINERALS_COUNT = std::to_string(mFacility->mine()->commonMineralsAvailable());
  RARE_METALS_COUNT = std::to_string(mFacility->mine()->rareMetalsAvailable());
  @@ -274,6 +270,7 @@ void MineOperationsWindow::update()
  renderer.drawText(*FONT, EXTENTION_TIME_REMAINING, {mRect.x() + EXTENSION_TURNS_REMAINING_POSITION, mRect.y() + 60}, NAS2D::Color::White);
  }
  + const auto MINE_DEPTH = std::to_string(mFacility->mine()->depth());
  renderer.drawText(*FONT_BOLD, "Depth:", {mRect.x() + MINE_DEPTH_POSITION, mRect.y() + 30}, NAS2D::Color::White);
  renderer.drawText(*FONT, MINE_DEPTH, {mRect.x() + MINE_DEPTH_VALUE_POSITION, mRect.y() + 30}, NAS2D::Color::White);
  