[*] BO : Allow complex GROUP BY in SQL Manager
A new version of my precedent pull-request

when you have some tags with attributes ( like img, ... )
[-] MO : Fix add truncate tag
Update GuestTrackingController.php

Fixed issue with retrocompatibility where the ->getFirst() caused a 505 error on the order_collection when a collection class was not loaded.
Merge pull request #846 from sebastienhouzet/patch-2

[-] MO : Fix add truncate tag in pscleaner
Merge pull request #835 from axometeam/patch-20

// Fixed potential issue with textarea
[-] BO : Double separator in function createTemplate()

smarty->getTemplateDir() returns a result ending with a separator,
so no need to add DIRECTORY_SEPARATOR ?
Update CONTRIBUTING.md
Merge pull request #1030 from ccauw/patch-13

[-] BO : Double separator in function createTemplate()
Merge pull request #863 from Prestaworks/patch-15

// Update GuestTrackingController.php
Merge pull request #780 from MyBB-Services/dev/gb/sqlmanagergroupby

[*] BO : Allow complex GROUP BY in SQL Manager
// updated Italian VAT rate
Merge pull request #1032 from djfm/development

// updated Italian VAT rate
[-] BO : Undefined on image upload, revert of https://github.com/PrestaShop/PrestaShop/commit/48b7a49b1aea34a2def355ffec1d4c08dfdbdfd6