The main problem with the current RTE configuration relies in the fact
that it is *only* configurable via pageTS.

CKEditor can now be configured via YAML, but the configuration preset
can be overriden via pageTS.

Additionally, the CKEditor Form Element is cleaned up.

A different preset can be used via PageTS config:
- RTE.default.preset = minimal
- RTE.config.tt_content.bodytext.preset = full

Once included, the next features will be
- a configuration backend module for ckeditor
- Make sure to re-add the feature for RTE.anchorClasses
- Check the languages of CKeditor that they are in line with the TYPO3
languages (possibility to add others)
- image handling
- table handling

Resolves: #78917
Releases: master
Change-Id: Ia222b73072b9e3fdb3a120d0be0a24a913552126
Reviewed-on: https://review.typo3.org/50919


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Daniel Gorges <daniel.gorges@b13.de>
Tested-by: Daniel Gorges <daniel.gorges@b13.de>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>