1349: Add support for SRS, related to #328 r=mergify[bot] a=kaiyou
## What type of PR?
Feature
## What does this PR do?
It implements SRS using a Python SRS library.
### Related issue(s)
- closes#328
## Prerequistes
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.
- [x] In case of feature or enhancement: documentation updated accordingly
- [x] Unless it's docs or a minor change: add [changelog](https://mailu.io/master/contributors/guide.html#changelog) entry file.
Co-authored-by: kaiyou <pierre@jaury.eu>
Florent Daigniere