[TASK] Ext:rtehtmlarea entry scripts cleanup

This patch turns all remaining RTE module scripts (mod4, mod5, mod6)
into CSRF protected wizards.

Resolves: #55674
Releases: 6.2
Change-Id: I8421ff05240f6eedcaf40c805d9dd92ea7d4c30b
Reviewed-on: https://review.typo3.org/28208
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring
Reviewed-by: Markus Klein
Tested-by: Markus Klein