Sebastian Michaelsen authored Nov 25, 2020 and Christian Kuhn committed Dec 01, 2020

Instead of having a hardcoded list of "trees" available
in the configuration module a new API is introduced and
all existing tree functionalities are moved into separate
provider classes to use the new API.

Extension authors are now able to add their own providers
to expose their custom configuration in the module. It's
even possible now to disable existing providers shipped
by core or any third-party extension.

Each provider is therefore registered in the `Services.yaml`
of the specific extension by defining the provider class
to be used and adding the `lowlevel.configuration.module.provider`
tag with at least the unique `identifier` attribute.

All providers must then implement the new `ProviderInterface`
to ensure the module can acquire the necessary data to
display the tree and the module menu.

The registration also provides a ordering / sorting
functionality using the DependencyOrderingService.

Resolves: #92929
Releases: master
Change-Id: I94e81e4b68ff9402444dca9449d251302380fd9f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66899


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>