[FEATURE] Load new content element wizard via modal instead of new page

Instead of having the new content element wizard in a separate module page
it will be opened in a modal now.

Resolves: #75676
Releases: master
Change-Id: If117fe3f2d55a4163bcb5c153b47938953050348
Reviewed-on: https://review.typo3.org/52999


Tested-by: Bjoern Jacob <bjoern.jacob@tritum.de>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Benjamin Kott <benjamin.kott@outlook.com>
Tested-by: Benjamin Kott <benjamin.kott@outlook.com>