Object Oriented Questions - New language edit system - Graphic Updates

- New question’s manager implemented: now for every question’s type there is a PHP class (and Javascript dedicated functions) that allows developer to implement new question’s type faster; simply add QT_XX.php, QT_XX.js, AT_XX.php and AT_XX.js and define functions like other question's type class (e.g. QT_MR.php, ...) 
- Now all variables in XML are used both in Javascript and PHP language files