[TASK] Remove unused ViewHelpers of EXT:install

The following ViewHelpers are not used and can be removed:

- file.size
- file.imageDimension

The ViewHelper format.crop of EXT:install can be replace by the one of
fluid.

Resolves: #81842
Releases: master
Change-Id: I094c96ff44f010304e59d9b6940a111067ffbfb7
Reviewed-on: https://review.typo3.org/53454


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Jigal van Hemert <jigal.van.hemert@typo3.org>
Tested-by: Jigal van Hemert <jigal.van.hemert@typo3.org>