void MergeCommon(Table original, Table newTable)
{
// ref not possible because of properties
original.Category = UpdateString (original.Category, newTable.Category);
original.Title = UpdateString (original.Title, newTable.Title);
original.Description = UpdateString (original.Description, newTable.Description);
original.NameX = UpdateString (original.NameX, newTable.NameX);
original.UnitX = UpdateString (original.UnitX, newTable.UnitX);
original.UnitY = UpdateString (original.UnitY, newTable.UnitY);
if (original.TableType != newTable.TableType)
original.ChangeTypeToAndReload (newTable.TableType, romStream);
}