Optimizations and Fixes

• Added an "Admin Dashboard"
  • You can manage (create, update, delete) users there
  • Passwords can be reset (and will be auto-generated)
• Small optimizations regarding layouts and views
• Show errors on the web if app.debug is set to true in config/settings.php
• Fixed the ErrorHandler
• Fixed two errors in is_current_path twig extension
• Added middleware for removing trailing slashes
• Added possibility to override OldInputMiddleware: Just set $_SESSION[forget_old_input] = true in the controller function when needed
• Some code refactoring
• Also updated README, installation is now a bit more easy