External project features, fixes and Laravel framework upgrade to 5.6

This release include new features and fix from an external project based on this boilerplate.

Features

• User email validation : When a new user register, he can't access to the dashboard until he confirm is email address.
• "Mark all as read" : New API route for notifications and a button permitting the user to mark all is new notifications as read in one action.

Fixes and miscellaneous

• Notifications handling in dashboard and new "flashes" dedicated components to manage "noty"
• Add of OpenApi Php DocBlock tags for MeNotification controller
• Api documentation config file updated for new notification route
• OpenApi schemas config file updated for new resources
• Registering validators, samples seeders, locales, templates, mails updated for users new features
• Add of IdeHelper package for "not" staging and production env
• Disabled custom exception handling (Strange behaviors to fix)
• External laravel-openapi-schema-generator package updated (fixes)
• Removed external project methods in I18nLang model
• debug_blacklist config add to hide sensible informations in debug env dump

Laravel

• Upgraded framework version from 5.4.* to 5.6.*
  • Disabled the CORS package temporarily (Need to upgrade for Laravel 5.5+ compatibility ?)
  • Moved logging configuration to dedicated config file
  • PHP 7.1+ is now required