Merge #942

942: Enable rainloop contacts r=mergify[bot] a=ionutfilip

## What type of PR?
bug-fix

## What does this PR do?
When composing a new email using rainloop email address autofill not working and you have to manually type it every time. Enabling contacts and contacts autosave solve this.
Also it enables remote synchronization.

### Related issue(s)

## 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: place entry in the [changelog](CHANGELOG.md), under the latest un-released version.


Co-authored-by: Ionut Filip <ionut.philip@gmail.com>
Co-authored-by: hoellen <dev@hoellen.eu>

webmails/rainloop/application.ini

@@ -8,3 +8,10 @@ allow_admin_panel = Off
 
 [labs]
 allow_gravatar = Off
+
+[contacts]
+enable = On
+allow_sync = On
+
+[plugins]
+contacts_autosave = On