[TASK] TYPO3 Coding Guidelines - Variablename must be lowerCamelCase

Change-Id: I8577d69e26c314bf12b78e1530047297f6ba7ebb
Resolves: #54676
Reviewed-on: https://review.typo3.org/26602
Reviewed-by: Alex Kellner
Tested-by: Alex Kellner