Redesign navigation bar on iOS

Limelight/Images.xcassets/SettingsButton.imageset/Contents.json

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+      "filename" : "settings.pdf",
+      "scale" : "1x"
+    },
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+    {
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+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

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