Add SQLCipher FAQ option in the Help menu

This new Help menu option only displays for SQLCipher enabled
builds.  For non-SQLCipher ones, it's not shown.

Closes #734.

src/MainWindow.cpp

@@ -182,6 +182,11 @@ void MainWindow::init()
     // Add keyboard shortcut for "Edit Cell" dock
     ui->viewMenu->actions().at(3)->setShortcut(QKeySequence(tr("Ctrl+E")));
 
+    // If we're not compiling in SQLCipher, hide it's FAQ link in the help menu
+#ifndef ENABLE_SQLCIPHER
+    ui->actionSqlCipherFaq->setVisible(false);
+#endif
+
     // Set statusbar fields
     statusEncryptionLabel = new QLabel(ui->statusbar);
     statusEncryptionLabel->setEnabled(false);
@@ -1985,6 +1990,11 @@ void MainWindow::on_actionBug_report_triggered()
     QDesktopServices::openUrl(QUrl("https://github.com/sqlitebrowser/sqlitebrowser/issues/new"));
 }
 
+void MainWindow::on_actionSqlCipherFaq_triggered()
+{
+    QDesktopServices::openUrl(QUrl("https://discuss.zetetic.net/c/sqlcipher/sqlcipher-faq"));
+}
+
 void MainWindow::on_actionWebsite_triggered()
 {
     QDesktopServices::openUrl(QUrl("http://sqlitebrowser.org"));

src/MainWindow.h

@@ -220,6 +220,7 @@ private slots:
     void on_butSavePlot_clicked();
     void on_actionWiki_triggered();
     void on_actionBug_report_triggered();
+    void on_actionSqlCipherFaq_triggered();
     void on_actionWebsite_triggered();
     void updateBrowseDataColumnWidth(int section, int /*old_size*/, int new_size);
     bool loadProject(QString filename = QString());

src/MainWindow.ui

@@ -888,6 +888,7 @@
     <addaction name="helpWhatsThisAction"/>
     <addaction name="actionWebsite"/>
     <addaction name="actionWiki"/>
+    <addaction name="actionSqlCipherFaq"/>
     <addaction name="actionBug_report"/>
     <addaction name="helpAboutAction"/>
    </widget>
@@ -1933,6 +1934,18 @@
     <string>Duplicate record</string>
    </property>
   </action>
+  <action name="actionSqlCipherFaq">
+   <property name="icon">
+    <iconset resource="icons/icons.qrc">
+     <normaloff>:/icons/browser_open</normaloff>:/icons/browser_open</iconset>
+   </property>
+   <property name="text">
+    <string>SQLCipher FAQ...</string>
+   </property>
+   <property name="toolTip">
+    <string>Opens the SQLCipher FAQ in a browser window</string>
+   </property>
+  </action>
  </widget>
  <customwidgets>
   <customwidget>