[BUGFIX] Re-introduce WebDAV-related HTTP methods

The following methods are added in order to have TYPO3
work as WebDAV server.

* COPY
* LOCK
* MKCOL
* MOVE
* PROPFIND
* PROPPATCH
* UNLOCK

Resolves: #69023
Releases: master
Change-Id: I50e52f2094654a97a83486032b10e34a89a6d5c3
Reviewed-on: http://review.typo3.org/42586


Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>