www/bacula-web: upgrade to 8.6.0

Changelog
General

Breaking change: Implemented front controller
Bacula-Web web app is now served from the public sub-folder, please
check the web server config documentation (see #114)
Replaced CHttpRequest class by Symfony framework Request class
Use combined operators in CUtil class (see #91)
Refactored PDO related PHP classes (see #100)
Updated composer.json by adding ext-pdo depencency (see #113)
Updated allowed plugin in composer.json (see #103)
Use PHP namespaces (see #118)
Fixed dozens of code smell warnings
Refactored good amount of the code
Moved flash message below header for better visibility
Improve handling of non-existant page requests
Fixed PHP notice after login (see #117)
Test page

Fixed wrong link to test page on error page
Translations

Updated translations with one more language (romanian) (see #92)
Security

Bump smarty/smarty from 3.1.45 to 3.1.47 (see #116)
Improved session management (see #68)
Improved how user input are sanitized (see #86)
Documentation

Fixed link to contributors on README
Updated list of components with license
Updated Apache and Nginx server configuration according to new public
root folder (see #114)
Fixed bug(s)
New feature(s)
none