Add code: TDataProxyFactory registration for SQL and DataProxy

[bogdanpolak]

In the generated Delphi code should be also code for the SQL and DataProxy. Something like:

const
  SQLSELECT_OneMonthOrders = 'SELECT * FROM Orders '+
  'WHERE {month ORDERDATE} = :MONTH AND {year  ORDERDATE} = :YEAR';
procedure RegisterSQLProxy;
begin
  AppDataProxyFactory.RegisterSQLProxy (TOrdersProxy, SQLSELECT_OneMonthOrders);
end;

And sample DataProxyFactory construction method, eg.:

var
  OrdersProxy: TOrdersProxy;
begin
  OrdersProxy :=  AppDataProxyFactory.ConstructAndOpenProxy (TOrdersProxy, [12, 2018]);
  ...