Drupal 11 compatibility

Working on it!

Alright, I've pushed some changes that should make it fully D11 compatible.

The biggest one was the constructor for the ConfigurationForm, in D11 an extra argument was required.
To keep backwards compatibility, I've removed the constructor entirely and set the custom properties in the static create() method.

This has the added advantage that any future changes to the constructor will be fully handled by the parent create() method, and we can simply set our own custom properties without having to worry about that.

Other than that, only a version requirement change was needed in composer & info.yml.

Hi @randalv, I have installed this module on a Drupal 11.2.2.
Identified compatibility issues with Drupal 11.
After merging MR !1, the module is now compatible with Drupal 11. Thanks.