Merge branch 'task/update-to-typo3-v9' into 'develop'

Last fixes for running in TYPO3 v9

See merge request !158
5 jobs for develop in 4 minutes and 4 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #13830
test:php

00:00:15

passed #13829
test:typoscript

00:00:18

 
  Build
passed #13831
build

00:00:29

 
  Layout
passed #13832
layout

00:01:52

 
  Deploy
passed #13833
deploy-develop

00:01:23