Add Global Bookmark feature

src/activities/home/HomeActivity.h

@@ -25,6 +25,7 @@ class HomeActivity final : public Activity {
   void onSelectBook(const std::string& path);
   void onFileBrowserOpen();
   void onRecentsOpen();
+  void onGlobalBookmarksOpen();
   void onSettingsOpen();
   void onFileTransferOpen();
   void onOpdsBrowserOpen();