Add ability to open the dashboard with a keyboard shortcut

Related feedback:
- https://github.com/gorhill/uBlock/commit/9a6feb34d546#commitcomment-38852663

platform/chromium/manifest.json

@@ -21,6 +21,9 @@
     "launch-logger": {
       "description": "__MSG_popupTipLog__"
     },
+    "open-dashboard": {
+      "description": "__MSG_popupTipDashboard__"
+    },
     "relax-blocking-mode": {
       "description": "__MSG_relaxBlockingMode__"
     }

platform/firefox/manifest.json

@@ -30,6 +30,9 @@
     "launch-logger": {
       "description": "__MSG_popupTipLog__"
     },
+    "open-dashboard": {
+      "description": "__MSG_popupTipDashboard__"
+    },
     "relax-blocking-mode": {
       "description": "__MSG_relaxBlockingMode__"
     }

platform/opera/manifest.json

@@ -21,6 +21,9 @@
     "launch-logger": {
       "description": "__MSG_popupTipLog__"
     },
+    "open-dashboard": {
+      "description": "__MSG_popupTipDashboard__"
+    },
     "relax-blocking-mode": {
       "description": "__MSG_relaxBlockingMode__"
     }

src/js/commands.js

@@ -179,7 +179,15 @@ vAPI.commands.onCommand.addListener(async command => {
         µb.openNewTab({
             url: `logger-ui.html${hash}`,
             select: true,
-            index: -1
+            index: -1,
+        });
+        break;
+    }
+    case 'open-dashboard': {
+        µb.openNewTab({
+            url: 'dashboard.html',
+            select: true,
+            index: -1,
         });
         break;
     }