message: Use getTile on full xyz coordinate
diff: @@ -762,7 +762,7 @@ void MapViewState::placeTubes()
  if (validTubeConnection(*mTileMap, mMouseTilePosition, cd))
  {
  - insertTube(cd, mTileMap->currentDepth(), &mTileMap->getTile(mMouseTilePosition.xy));
  + insertTube(cd, mTileMap->currentDepth(), &mTileMap->getTile(mMouseTilePosition));
  // FIXME: Naive approach -- will be slow with larger colonies.
  NAS2D::Utility<StructureManager>::get().disconnectAll();
  