[FEATURE] EXT:form - Add form settings button to module header

Adds a new button into the form editor module header.
Clicking on this buttons shows the form settings within the inspector.

Resolves: #79467
Releases: master
Change-Id: I767c71fcf65ca5bd58b2b530a60fce1caf75e3c9
Reviewed-on: https://review.typo3.org/51425


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Steiger <typo3@andreassteiger.de>
Tested-by: Andreas Steiger <typo3@andreassteiger.de>
Tested-by: Riccardo De Contardi <erredeco@gmail.com>
Reviewed-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Tested-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>