[TASK] RTE: Move modules to Modules directory

Move the RTE wizards to Modules directory and cleanup configuration and
class structure.

Releases: master
Resolves: #62731
Change-Id: Ib5eaa065435ea1d09e539059301f22538d4c4d63
Reviewed-on: http://review.typo3.org/33836
Reviewed-by: Stanislas Rolland <typo3@sjbr.ca>
Tested-by: Stanislas Rolland <typo3@sjbr.ca>