dirvalid(folder,var​argin)

% p = dirvalid([],varargin) or p=dirvalid: without specified folder dirvalid will return cd
% p = dirvalid(folder) returns only valid folders and files and ignores
% hidden files within folder.
% p = dirvalid('',varargin), varargin is optional. See varargin options for specific outputs.
% [p,f] = dirvalid() seperates folders (p) from files (f).
%
% Ben van Oeveren, VU-Amsterdam, 15-Apr-2016
%
%% varargin (output) options:
% 'struct': default, will give the same output as dir
% 'name': 'example'
% 'path': 'example.ext'
% 'fullpath': 'anotherfolder/myfolder/example.ext'
% 'f': only files
% 'p': only folders