Set user permissions for columns

[minstyle]

Please add the functionality with 'exclude' => true to have in Contao the possibility to define user permissions for columns.

https://github.com/madeyourday/contao-rocksolid-columns/blob/f374419df7d366cc98c18808650d464d6f411eda/src/Resources/contao/dca/tl_content.php

$GLOBALS['TL_DCA']['tl_content']['fields']['rs_columns_large'] = array(
	'exclude' => true,
	'inputType' => 'text',
	'label' => &$GLOBALS['TL_LANG']['tl_content']['rs_columns_large'],
	'eval' => array(
		'tl_class' => 'rs_columns_w33',
	),
	'sql' => "varchar(255) NOT NULL default ''",
);
$GLOBALS['TL_DCA']['tl_content']['fields']['rs_columns_medium'] = array(
	'exclude' => true,
	'inputType' => 'text',
	'label' => &$GLOBALS['TL_LANG']['tl_content']['rs_columns_medium'],
	'eval' => array(
		'tl_class' => 'rs_columns_w33',
	),
	'sql' => "varchar(255) NOT NULL default ''",
);
$GLOBALS['TL_DCA']['tl_content']['fields']['rs_columns_small'] = array(
	'exclude' => true,
	'inputType' => 'text',
	'label' => &$GLOBALS['TL_LANG']['tl_content']['rs_columns_small'],
	'eval' => array(
		'tl_class' => 'rs_columns_w33',
	),
	'sql' => "varchar(255) NOT NULL default ''",
);