[filter] Add useful filters from % and * dired maps

[Fuco1]

In case someone wants to implement this, feel free to comment here and send a patch :)

• [ ] (define-key map "**" 'dired-mark-executables)
• [ ] (define-key map "*/" 'dired-mark-directories)
• [ ] (define-key map "*@" 'dired-mark-symlinks)
• [ ] (define-key map "*%" 'dired-mark-files-regexp)
• [ ] (define-key map "*N" 'dired-number-of-marked-files)
• [ ] (define-key map "*c" 'dired-change-marks)
• [ ] (define-key map "*s" 'dired-mark-subdir-files)
• [ ] (define-key map "*m" 'dired-mark)
• [ ] (define-key map "*u" 'dired-unmark)
• [ ] (define-key map "*?" 'dired-unmark-all-files)
• [ ] (define-key map "*!" 'dired-unmark-all-marks)