[FEATURE] Allow fallback paths in FLUIDTEMPLATE

Resolves: #61361
Releases: master, 6.2
Change-Id: I676722936892f164ae147d7f9abcb602e734ae7d
Reviewed-on: http://review.typo3.org/34421
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: ian excedo <ian@webian.it>
Tested-by: ian excedo <ian@webian.it>
Reviewed-by: Robert Wildling <robertwildling@gmail.com>
Tested-by: Robert Wildling <robertwildling@gmail.com>