Add "Load Style" methods to `TMVCActiveRecord`

[danieleteti]

Currently TMVCActiveRecord and its class helper, provide "Factory Style" methods.

With such kind of methods the result list is returned by the loader method (as shown in this piece of code from the TMVCActiveRecord show case sample).

  Log('>> RQL Query (2) - ' + cRQL2);
  lCustList := TMVCActiveRecord.SelectRQL<TCustomer>(cRQL2, 20);
  try
    Log(lCustList.Count.ToString + ' record/s found');
    for lCustomer in lCustList do
    begin
      Log(Format('%5s - %s (%s)', [lCustomer.Code.ValueOrDefault,
        lCustomer.CompanyName.ValueOrDefault, lCustomer.City]));
    end;
  finally
    lCustList.Free;
  end;

For some scenarios would be useful to have also "Load Style" methods where the list is filled by the loader method (not instantiated internally).

  Log('>> RQL Query (2) - ' + cRQL2);
  lCustList := TObjectList<TCustomer>.Create;
  try
    lRecCount := TMVCActiveRecord.SelectRQL<TCustomer>(cRQL2, 20, lCustList);
    Log(lRecCount.ToString + ' record/s found');
    for lCustomer in lCustList do
    begin
      Log(Format('%5s - %s (%s)', [lCustomer.Code.ValueOrDefault,
        lCustomer.CompanyName.ValueOrDefault, lCustomer.City]));
    end;
  finally
    lCustList.Free;
  end;