Hack SwiftMailer to escape 'name' part of email addresses

This fixes intermittent issues with email alerts and other email sending.

Most emails in the platform send with FROM: sitename <siteemail>
However without any escaping then adding spaces and other characters (notable ```:```) to the site name yields very weird results. For example something like
```My deployment: dev <dev@somedomain.com>``` gets split into 3 email addresses..