[TASK] Allow chaining in class ModuleTemplate

For slightly more dense code ModuleTemplate now
returns $this on setter methods to allow chaining.

Change-Id: Icd92d37370529a0535b4c2d5dcf2e588bd50a6ae
Resolves: #83910
Releases: master
Reviewed-on: https://review.typo3.org/55728


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Tested-by: Mathias Schreiber <mathias.schreiber@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>