Create a Mailer Plus 2.0 (symfony mailer) compatible version [#3571137]

Current version is not compatible with version 2.0 of the Mailer Plus module.

Create a 2.0 compatible version.

Code review.

None.

Namespace of plugin has changed.
Mailer Plus will migrate configuration into new config.

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Start within a Git clone of the project using the version control instructions.

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2.0.x changes, plain diff MR !11
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