message: Rename MapTerrainExtension constant
diff: @@ -20,7 +20,7 @@ using namespace NAS2D;
  namespace {
  - const std::string MAP_TERRAIN_EXTENSION = "_a.png";
  + const std::string MapTerrainExtension = "_a.png";
  const auto MapSize = NAS2D::Vector{300, 150};
  const auto TileSize = NAS2D::Vector{128, 55};
  @@ -199,7 +199,7 @@ Tile& TileMap::getTile(const MapCoordinate& position)
  */
  void TileMap::buildTerrainMap(const std::string& path)
  {
  - const Image heightmap(path + MAP_TERRAIN_EXTENSION);
  + const Image heightmap(path + MapTerrainExtension);
  const auto levelCount = static_cast<std::size_t>(mMaxDepth) + 1;
  mTileMap.resize(mSizeInTiles.x * mSizeInTiles.y * levelCount);
  