qt: show payment information in one text area

Simplifies the dialog (makes it look less crowded) as well
as the code and makes it possible to copy multiple fields at once.
Also format bitcoin URI as URI, add copy button for URI.

src/qt/receivecoinsdialog.cpp

@@ -98,8 +98,9 @@ void ReceiveCoinsDialog::on_receiveButton_clicked()
     }
     SendCoinsRecipient info(address, label,
             ui->reqAmount->value(), ui->reqMessage->text());
-    ReceiveRequestDialog *dialog = new ReceiveRequestDialog(info, this);
+    ReceiveRequestDialog *dialog = new ReceiveRequestDialog(this);
     dialog->setModel(model->getOptionsModel());
+    dialog->setInfo(info);
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     dialog->show();
     clear();