[!!!][SECURITY] Add CSRF Protection for tce_file.php

Add a token check in tce_file.php and token generation
everywhere forms for or links to tce_file.php are created.

Additionaly make sure, an instance of ExtendedFileUtility
is created in FileController on initialization to prevent
a fatal "Call to a member function on a non-object" error
in FileController::finish.

Releases: 6.2
Resolves: #55515
Change-Id: Ifd585661ac2cac6c88eaca5ad63b447d27e35395
Reviewed-on: https://review.typo3.org/27691
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel