* Code cleaning and fix some small errors using Phpstan
* Configure pre-commit to run Phpstan before each commit
* Some little improvments and logging, mail, smarty & URL libs
* Add Sentry integration
* Add Webstat JS code inclusion
* Install Smarty dependency using composer
Breaking changes:
* Rename Event class as HookEvent to avoid conflict with PECL event
* URL with refresh GET parameter now automatically trigger redirection without it
after page loading to avoid to keep it in URL
- Add support for translations in JavaScript code using babel lib and
a custom PO file converter to JSON (using sepia/po-parser lib for
PO files parsing)
- Put translation CLI commands in a dedicated file
- update_messages CLI command now provide PO file initialization feature
using msginit and support of compendium files
