[TASK] Fluid: Migrate same methods into AbstractTemplateView

StandaloneView currently replicates a lot of code which is already
present within TemplateView (= Extbase), however, both classes inherit
from AbstractTemplateView.

In order to see which parts are different (and continue on streamlining
fluid) the parts can be placed within AbstractTemplateView.

Resolves: #82269
Releases: master
Change-Id: I4184a5899b98227cf50f93db6c3ae38812cc86ec
Reviewed-on: https://review.typo3.org/53831


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Joerg Boesche <typo3@joergboesche.de>
Tested-by: Joerg Boesche <typo3@joergboesche.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>