Extension de notification par email pour le Moniteur de téléchargement 4.2.1

Fixed: Sometimes not sending emails due to empty email 'from' issue.

* Fixed: Sending download email notification even for failed downloads

#### 4.1.9: 09.08.2022
* Fixed: DLM 4.6.0 compatibility
* Fixed: Admin notices on priority 8 and PHP 5.6 compatibility