Jet Core - Mailing

------------
* Jet\Mailing_Email -> parseImages(): HTML images are now embedded in the HTML and not attached to the email as a special attachment.
* Jet\Mailing_Email: new method addAttachmentsData( string $file_name, string $file_mime_type, string $file_data ) : void
* Jet\Mailing_Email: new method addImageData( string $cid, string $file_name, string $file_mime_type, string $file_data ) : void
* New class internal Mailing_Email_File representing e-mail attachment

Author: mirekmarek

library/Jet/Mailing/Backend/Default.php

@@ -33,6 +33,7 @@ public function sendEmail( Mailing_Email $email ): bool
 			$to = implode(', ', $to);
 		}
 
+
 		return mail( $to, $subject, $message, $header );
 
 	}

library/Jet/Mailing/Email.php

@@ -151,9 +151,6 @@ public function setToHiddenCopy( array|string $to_hidden_copy ): void
 		$this->to_hidden_copy = $to_hidden_copy;
 	}
 
-
-
-
 	/**
 	 * @return string
 	 */