Add `walkPattern` to return both files and directories
Add `walkPattern` to return both files and directories

Also added `walkDirs` to walk only directories based on the pattern
specified.

zachaysan/Nim,tulayang/Nim,zachaysan/Nim,jfhg/Nim,russpowers/Nim,jfhg/Nim,dom96/Nim,mbaulch/Nim,zachaysan/Nim,haiodo/Nim,dom96/Nim,tulayang/Nim,haiodo/Nim,mbaulch/Nim,haiodo/Nim,tulayang/Nim,singularperturbation/Nim,mbaulch/Nim,dom96/Nim,tulayang/Nim,russpowers/Nim,russpowers/Nim,haiodo/Nim,dom96/Nim,zachaysan/Nim,singularperturbation/Nim,haiodo/Nim,singularperturbation/Nim,haiodo/Nim,singularperturbation/Nim,haiodo/Nim,russpowers/Nim,jfhg/Nim,zachaysan/Nim,mbaulch/Nim,singularperturbation/Nim,tulayang/Nim,singularperturbation/Nim,mbaulch/Nim,dom96/Nim,russpowers/Nim,russpowers/Nim,zachaysan/Nim,dom96/Nim,russpowers/Nim,mbaulch/Nim,zachaysan/Nim,jfhg/Nim,singularperturbation/Nim,jfhg/Nim,mbaulch/Nim,jfhg/Nim,jfhg/Nim,dom96/Nim,tulayang/Nim