Moved definition of tableName to the Isis namespace in header file

namespace Isis {

  /**

   * @brief 

   * @author 2004-09-01 Jeff Anderson

   * @author 2018-07-19 Jesse Mapel & Summer Stapleton

   *

   * @internal

   *   @history 2005-03-18 Elizabeth Ribelin - Added documentation to class

   */

  const QString tableName = "InputImages";

  class TrackingTable{

    public:

      const QString tableName = "InputImages";

      TrackingTable();

      TrackingTable(Table table);