2631: Restful api finishing touches r=mergify[bot] a=Diman0
## What type of PR?
enhancement
## What does this PR do?
Some finishing touches for the restful api.
- Make the API configurable via the setup utility.
- Configured exactly the same as the ADMIN and WEBMAIL.
- We have a single config (API) that configures whether it is exposed (via front). Just like ADMIN. The API is always reachable by directly connecting to the admin container.
- API_TOKEN does not enable/disable the API anymore. When it is not configured, an error is returned (via the internet browser) that the API_TOKEN must be configured in mailu.env.
- Fix some small bugs in the setup utility ( selecting none in the dropdown boxes, now correctly changes the config)
- Update Flask-RestX to 1.0.5. This resolves the deprecation warnings introduced by Flask-RestX.
### Related issue(s)
## Prerequisites
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/workflow.html#changelog) entry file.
Co-authored-by: Dimitri Huisman <diman@huisman.xyz>
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