message: Convert copy to move
  This commit converts 3 spots of copy construction into move
  construction.
  `return data` was not converted to a move because it should be easily
  RVO'able.
diff: @@ -1024,9 +1024,9 @@ const TextBuffer::TextAndColor TextBuffer::GetTextForClipboard(const bool lineSe
  }
  }
  - data.text.emplace_back(selectionText);
  - data.FgAttr.emplace_back(selectionFgAttr);
  - data.BkAttr.emplace_back(selectionBkAttr);
  + data.text.emplace_back(std::move(selectionText));
  + data.FgAttr.emplace_back(std::move(selectionFgAttr));
  + data.BkAttr.emplace_back(std::move(selectionBkAttr));
  }
  return data;
  