Simple file permissions control

TODO describe more how locked and hidden works

Assign an attributes array inside the specific mounted driver you would like to set the permissions for.

Example:

<?php
array(
	'driver' => 'LocalFileSystem', // driver for accessing file system (REQUIRED)
	'path'   => 'path/to/files',   // path as root to files (REQUIRED)
	'attributes' => array(
　　　　　　　　　// The first matching of the multiple patterns will be applied. (elFinder >= 2.1.33)
		array(
			// You can also set permissions for file types by adding, for example, \.jpg inside pattern.
                        // The path for pattern evaluation is passed by converting the path as the root to '/'.
                        'pattern' => '/^\/TEST$/',
			'read'    => false,
			'write'   => false,
			'locked'  => true
		)
	)
),

You can set the following true/false to the attributes:

'read'   => true/false,
'write'  => true/false,
'locked' => true/false,
'hidden' => true/false

Discussion: https://github.com/Studio-42/elFinder/issues/98#issuecomment-1866553