v3.0.3

• Add Firebase support including user authentication,
  user database, and file storage
• Add google sign in
• Rename add_user_database to add_user_database_using_sql
• Replace get_current_user with other methods that gets the users data: get_current_user_data,
  set_current_user_data, and get_current_user_id.
• Add email_exists function.
• Add is_signed_in function.
• Add RedirectingPage for pages that are created only to redirect to another page.
• Different method for storing temporary user variables
• A method that adds navigation bar to page
• Fixes

Full Changelog: v2.4.1...v3.0.3