Add View -> Debug Log to menu bar

Just send an event from the main process to the renderer,
The latter routes it the appropriate view method.

For now it's a no-op unless the main window exists and it is showing the inbox,
which will be addressed in a future commit.

// FREEBIE

app/menu.js

@@ -36,6 +36,12 @@ const template = [
   {
     label: 'View',
     submenu: [
+      {
+        label: 'Debug Log'
+      },
+      {
+        type: 'separator'
+      },
       {
         role: 'reload'
       },

js/background.js

@@ -78,6 +78,9 @@
             appView.openInstaller();
         }
 
+        Whisper.events.on('showDebugLog', function() {
+            appView.inboxView.showDebugLog();
+        });
         Whisper.events.on('unauthorized', function() {
             appView.inboxView.networkStatusView.update();
         });

main.js

@@ -149,6 +149,12 @@ function createWindow () {
   });
 }
 
+function showDebugLog() {
+  if (mainWindow) {
+    mainWindow.webContents.send('debug-log')
+  }
+}
+
 // This method will be called when Electron has finished
 // initialization and is ready to create browser windows.
 // Some APIs can only be used after this event occurs.
@@ -169,6 +175,9 @@ app.on('ready', function() {
     template[3].submenu[3].click = function() {
       mainWindow.show();
     };
+    template[2].submenu[0].click = showDebugLog;
+  } else {
+    template[1].submenu[0].click = showDebugLog;
   }
 
   const menu = Menu.buildFromTemplate(template);

preload.js

@@ -24,6 +24,9 @@
     console.log('restart');
     ipc.send('restart');
   };
+  ipc.on('debug-log', function() {
+    Whisper.events.trigger('showDebugLog');
+  });
   /**
   * Enables spell-checking and the right-click context menu in text editors.
   * Electron (`webFrame.setSpellCheckProvider`) only underlines misspelled words;