qt: general polish after adding new receive flow

- We no longer have an address book, but "address lists", update message
  accordingly
- Add tooltips here and there
- Clarify text on buttons
- add Copy Address button to receive request dialog

src/qt/receiverequestdialog.h

@@ -44,6 +44,7 @@ public:
 
 private slots:
     void on_btnCopyURI_clicked();
+    void on_btnCopyAddress_clicked();
 
     void update();