Support for optionally controlling column properties

Created by: jaw

Support for width, hidden,collapsed through an array of this object:

class XLSXColumnInfo
{
	public $collapsed = false;
	public $hidden = false;
	public $width = '11.5';

	public function __construct($width, $collapsed = false, $hidden = false)
	{
		$this->width = $width;
		$this->collapsed = $collapsed;
		$this->hidden = $hidden;
	}
}

Maybe this can be extended later on to support styles as well.