rtl option for right to left languages

add rtl option for right to left languages such as arabic

// add this field after private $_fgColor;
private $_rtl;

// add this line in the constructor "public function __construct"
// after $this->_fgColor = null;
$this->_rtl = null;

// add this two methods at the end of the class

public function getRtl() {
    return $this->_rtl;
}

public function setRtl($pValue = false) {
    if($pValue == '') {
        $pValue = false;
    }
    $this->_rtl = $pValue;
    return $this;
}