[BUGFIX] Resolve t3: URI to FAL objects for src attributes

Files in FAL can be linked with a t3://file link. Those URIs can
now be used in e.g. src attributes of the image viewhelper.
In v7 links to files had the format "file:<uid>" and those are supported
in such cases.

Resolves: #81820
Releases: master, 8.7
Change-Id: I6dbda26df0dfc4f4272425b9f2c0099e2d710015
Reviewed-on: https://review.typo3.org/53423


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>