[!!!][TASK] Drop RTE config skipAlign and skipClass

The two options to define whether to not allow align or class
attributes on <p> tags when converting from RTE to the DB
are dropped in favor of using keepPDIVattribs and adding them there
by default.

Resolves: #75710
Releases: master
Change-Id: Ie981a3f15f02f81c9721e2ee9421e183319f5b90
Reviewed-on: https://review.typo3.org/47728


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: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>