[FEATURE] Improve Usability in Workspaces module

The workspaces module has a better style and some
improvements for editors and administrators:

* Editors now get feedback if an AJAX call shows no results
* Editors + Administrators now switch workspace via a selector,
  very helpful when having more than a couple of workspaces
* Administrators can now edit a workspace record
  directly from the module

The change cleans up a lot of unused code in the main workspaces
module and brings a few UX improvements within the module.

* Dropdowns instead of tabs (good when having a lot of workspaces)
* Language + Depth + Action selection is now rendered via
  Controller+Action instead of waiting for a first AJAX round trip
* Properly using "moduleData" from "uc" to store information
* Solved issues related to language icon rendering
* Removed unused inline settings
* Consistent usage of Persistent JS module accessing BE_Users' UC
* nProgress for showing progress of loading AJAX requests

Next steps in this area:
* Hand in the first payload as JSON to avoid AJAX call on
  initial page load
* Remove leftover inline JavaScript

Resolves: #94819
Releases: master
Change-Id: Ie533656a14af56dad4a4039fcbc9b08bde693500
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70452


Tested-by: core-ci <typo3@b13.com>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>