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/receiverequestdialog.h

@@ -36,25 +36,21 @@ class ReceiveRequestDialog : public QDialog
     Q_OBJECT
 
 public:
-    explicit ReceiveRequestDialog(const SendCoinsRecipient &info, QWidget *parent = 0);
+    explicit ReceiveRequestDialog(QWidget *parent = 0);
     ~ReceiveRequestDialog();
 
     void setModel(OptionsModel *model);
+    void setInfo(const SendCoinsRecipient &info);
 
 private slots:
-    void on_lnReqAmount_textChanged();
-    void on_lnLabel_textChanged();
-    void on_lnMessage_textChanged();
+    void on_btnCopyURI_clicked();
 
-    void updateDisplayUnit();
+    void update();
 
 private:
     Ui::ReceiveRequestDialog *ui;
     OptionsModel *model;
     SendCoinsRecipient info;
-
-    void genCode();
-    QString getURI();
 };
 
 #endif // QRCODEDIALOG_H