[TC-74] Stop using MIME::Lite to send email

[limited]

Traffic Ops currently uses the MIME::Lite library to send email.

According to the MIME::Lite documentation:

MIME::Lite is not recommended by its current maintainer. There are a number of alternatives, like Email::MIME or MIME::Entity and Email::Sender, which you should probably use instead. MIME::Lite continues to accrue weird bug reports, and it is not receiving a large amount of refactoring due to the availability of better alternatives. Please consider using something else.

Here is a list of bugs logged against MIME::Lite - https://rt.cpan.org/Public/Dist/Display.html?Name=MIME-Lite

Author: Jeremy Mitchell
JIRA Link: https://issues.apache.org/jira/browse/TC-74