rxu

[ticket/16935] Add sphinx tests

12

Checklist: - [x] Correct branch: master for new features; 3.3.x for fixes - [ ] Tests pass - [x] Code follows coding guidelines: [master](https://area51.phpbb.com/docs/master/coding-guidelines.html) and [3.3.x](https://area51.phpbb.com/docs/dev/3.3.x/development/coding_guidelines.html) - [x] Commit follows...

[ticket/15790] Allow dynamic loading services files for extensions

7

Checklist: - [x] Correct branch: master for new features; 3.2.x for fixes - [x] Tests pass - [x] Code follows coding guidelines: [master](https://area51.phpbb.com/docs/dev/master/development/coding_guidelines.html) and [3.2.x](https://area51.phpbb.com/docs/dev/3.2.x/development/coding_guidelines.html) - [x] Commit follows commit...

[ticket/17135] Introduce Symfony Mailer for emails backend

12

Checklist: - [x] Correct branch: master for new features; 3.3.x for fixes - [x] Tests pass - [x] Code follows coding guidelines: [master](https://area51.phpbb.com/docs/master/coding-guidelines.html) and [3.3.x](https://area51.phpbb.com/docs/dev/3.3.x/development/coding_guidelines.html) - [x] Commit follows commit...

[ticket/17151] Make settings forms use macros

5

PHPBB3-17151 Checklist: - [x] Correct branch: master for new features; 3.3.x for fixes - [x] Tests pass - [x] Code follows coding guidelines: [master](https://area51.phpbb.com/docs/master/coding-guidelines.html) and [3.3.x](https://area51.phpbb.com/docs/dev/3.3.x/development/coding_guidelines.html) - [x] Commit follows...

`master` version of #6662. Checklist: - [x] Correct branch: master for new features; 3.3.x for fixes - [x] Tests pass - [x] Code follows coding guidelines: [master](https://area51.phpbb.com/docs/master/coding-guidelines.html) and [3.3.x](https://area51.phpbb.com/docs/dev/3.3.x/development/coding_guidelines.html) -...

Before After Checklist: - [x] Correct branch: master for new features; 3.3.x for fixes - [x] Tests pass - [x] Code follows coding guidelines: [master](https://area51.phpbb.com/docs/master/coding-guidelines.html) and [3.3.x](https://area51.phpbb.com/docs/dev/3.3.x/development/coding_guidelines.html) - [x] Commit...

`3.3.x` version. Checklist: - [x] Correct branch: master for new features; 3.3.x for fixes - [x] Tests pass - [x] Code follows coding guidelines: [master](https://area51.phpbb.com/docs/master/coding-guidelines.html) and [3.3.x](https://area51.phpbb.com/docs/dev/3.3.x/development/coding_guidelines.html) - [x] Commit...

Checklist: - [x] Correct branch: master for new features; 3.3.x for fixes - [x] Tests pass - [x] Code follows coding guidelines: [master](https://area51.phpbb.com/docs/master/coding-guidelines.html) and [3.3.x](https://area51.phpbb.com/docs/dev/3.3.x/development/coding_guidelines.html) - [x] Commit follows commit...