[TASK] Optimize modeler view

Various css modifications, to use less space per model
and to have bigger textfields and textareas

Resolves: #54440
Releases: 6.0,6.1,6.2
Change-Id: Ie492bd4f5d337f94d76e3e06b5c329875c229387
Reviewed-on: https://review.typo3.org/26442
Reviewed-by: Nico de Haen
Tested-by: Nico de Haen