Save/Restore window positions

- #29 - Settings window
- #28 - zboard
- #27 - turnstile
- turnstile progress
- import keys
- export keys

src/addressbook.cpp

@@ -117,6 +117,7 @@ void AddressBook::open(MainWindow* parent, QLineEdit* target) {
     QDialog d(parent);
     Ui_addressBook ab;
     ab.setupUi(&d);
+    Settings::saveRestore(&d);
 
     AddressBookModel model(ab.addresses);
     ab.addresses->setModel(&model);