message: Use DirectionOffset in MapViewState::diggerSelectionDialog
diff: #include "MainMenuState.h"
  #include "../Constants.h"
  -
  +#include "../DirectionOffset.h"
  #include "../StructureCatalogue.h"
  #include "../StructureTranslator.h"
  @@ -473,19 +473,19 @@ void MapViewState::diggerSelectionDialog(Direction direction, Tile* tile)
  if (direction == Direction::DIR_NORTH)
  {
  - mTileMap->getTile(tile->x(), tile->y() - 1, tile->depth())->excavated(true);
  + mTileMap->getTile(tile->position() + DirectionNorth, tile->depth())->excavated(true);
  }
  else if (direction == Direction::DIR_SOUTH)
  {
  - mTileMap->getTile(tile->x(), tile->y() + 1, tile->depth())->excavated(true);
  + mTileMap->getTile(tile->position() + DirectionSouth, tile->depth())->excavated(true);
  }
  else if (direction == Direction::DIR_EAST)
  {
  - mTileMap->getTile(tile->x() + 1, tile->y(), tile->depth())->excavated(true);
  + mTileMap->getTile(tile->position() + DirectionEast, tile->depth())->excavated(true);
  }
  else if (direction == Direction::DIR_WEST)
  {
  - mTileMap->getTile(tile->x() - 1, tile->y(), tile->depth())->excavated(true);
  + mTileMap->getTile(tile->position() + DirectionWest, tile->depth())->excavated(true);
  }
  