[!!!][TASK] RTE: Remove deprecated ts & ts_transform

As stated in the official documentation since TYPO3 4.0
the transformation option "ts" and "ts_transform" are
outdated and only for very old transformations (before
there was CSS Styled Content).

The option is marked as obsolete and outdated in the
documentation already, so it is removed in the code as well.

Resolves: #72830
Releases: master
Change-Id: Ibd8e34071e784d41db0f8a76059c150308820dbb
Reviewed-on: https://review.typo3.org/46104


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: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>