update hooks lookup to use <hook>.d/* from repository hooks dir

the order would be:

1. <repository>.git/custom_hooks/<hook_name> - per project hook
2. <repository>.git/custom_hooks/<hook_name>.d/* - per project hooks
3. <repository>.git/hooks/<hook_name>.d/* - global hooks

only executable files are matched and backup files excluded (*~)
and the resulting list is sorted per each lookup