message: Standardize how map property attributes are loaded
diff: @@ -147,17 +147,19 @@ void MapViewState::load(const std::string& filePath)
  XmlElement* map = root->firstChildElement("properties");
  int depth = 0;
  std::string sitemap;
  + std::string tilesetPath;
  XmlAttribute* attribute = map->firstAttribute();
  while (attribute)
  {
  if (attribute->name() == "diggingdepth") { attribute->queryIntValue(depth); }
  else if (attribute->name() == "sitemap") { sitemap = attribute->value(); }
  + else if (attribute->name() == "tset") { tilesetPath = attribute->value(); }
  attribute = attribute->next();
  }
  mMapDisplay = Image(sitemap + MAP_DISPLAY_EXTENSION);
  mHeightMap = Image(sitemap + MAP_TERRAIN_EXTENSION);
  - mTileMap = new TileMap(sitemap, map->attribute("tset"), depth, 0, Planet::Hostility::None, false);
  + mTileMap = new TileMap(sitemap, tilesetPath, depth, 0, Planet::Hostility::None, false);
  mTileMap->deserialize(root);
  delete pather;
  