It would be helpful for phobos to provide a way to remove readonly files on windows.

A common use case is when removing git repositories.  On windows, git creates readonly files inside its ".git" sub-directory.  This means phobos' `remove` and `rmdirRecurse` functions will fail when trying to delete directories that contain git repositories.

To remove readonly files on windows, you must remove the READONLY file attribute.  I'd like to see phobos provide functionality to remove files and directories with readonly files in them.