[!!!][TASK] RTE transformations: Allow div sections by default

Treat DIV as block elements by default (= remove "preserveDIVSections"). The info is now stored
within "blockElementList".

KeepTags "font" and "allowedFontColors" is now
treated like any other tag and attribute values.

Thus, the TSconfig options within RTE.default.proc

 - allowedFontColors
 - preserveDIVSections

have no effect anymore.

Resolves: #72837
Releases: master
Change-Id: I81daf95737058076fbf6bda763a39a7c02f7b732
Reviewed-on: https://review.typo3.org/46103


Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>