Browser+LibWeb+WebContent: Add ability to inspect local storage

The storage inspector now has a new tab for local storage. The next step
would be to persist local storage and receive real-time notifications
for changes to update the table view.

Userland/Applications/Browser/CMakeLists.txt

@@ -25,6 +25,7 @@ set(SOURCES
     History.cpp
     IconBag.cpp
     InspectorWidget.cpp
+    LocalStorageModel.cpp
     StorageWidget.cpp
     StorageWidgetGML.h
     Tab.cpp