feat: add custom ignore dir/files.

[okayno14]

Deafault config contains in autoload/ignore_tree/ignore_tree.vim. And can be customized by editing g:fuzzyy_custom_ignore: Example:

   let g:fuzzyy_custom_ignore = {
       \ 'dir': ['.git', '.hg', '.svn', '.rebar', '.eunit'],
       \ 'file': ['*.beam', '*.so', '*.exe', '*.dll', '*.dump', '*.core', '*.swn', '*.swp'],
  \ }