message: Move ResourceTrend code into unnamed namespace
diff: @@ -18,6 +18,8 @@ using namespace NAS2D;
  static const Font* FONT = nullptr;
  +namespace
  +{
  enum class ResourceTrend
  {
  None,
  @@ -37,8 +39,6 @@ static ResourceTrend compareResources(int src, int dst)
  }
  -namespace
  -{
  std::string formatDiff(int diff)
  {
  return ((diff > 0) ? "+" : "") + std::to_string(diff);
  