Support for more settings

Okay I will commit here my first approach to solve the possible ReadSpeaker configuration at all.
If anyone has some motivation to support this it would be kick ass. Any help is really appreciated.

Opinion to the cb (javascript callbacks) config:

I think there is no usefull case to support that from config perspective.
This are raw javascript callbacks that should be handled in the javascript world itself. (library)

You can define a new library like this to attach your custom javascript to the open_readspeaker/conf library.

# my-custom-module-or-theme.libraries.yml
open_readspeaker_callbacks:
  version: VERSION
  js:
    js/cb.js: { }
  dependencies:
    - open_readspeaker/conf

// cb.js
(function (rsConf) {
  'use strict';
  const callbacks = { cb: { ui: { open: function() { console.log('Open Callback!') }}}}
  window.rsConf = { ...rsConf, ...callbacks};
})(rsConf);

I think a paragraph in the README.md should be enough to inform the Drupal-Developers / Site-Builders.

I think this is ready for now.

I left a TODO for the phrases config-map.
Currently I have no use case for this so I tend to spin off a follow-up to track the use case from the community.

Merged.
I will update the update-hook later on, if all config changes are in place, so we get one update-hook for the full config migration.

Automatically closed - issue fixed for 2 weeks with no activity.