[TASK] Implement conflict handling into renameFile()

Upon DuplicationBehaviour::RENAME and ~::REPLACE, the according function
is called for the given file. For DuplicationBehaviour::CANCEL, the same
exception as before is thrown.

For a better UX, the existance of a possible duplicate is checked and a
modal window is rendered to the users to let them choose the desired
action if a duplicate was found.

Resolves: #80282
Releases: master
Change-Id: Ie67f04184a232fc23a3cda648692783771ba5171
Reviewed-on: https://review.typo3.org/52048


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.org>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>