[TASK] Unify element- and linkbrowser styling

Introducing a more adaptive and inclusive experience to the element-
and linkbrowser.

Resolves: #80463
Resolves: #80205
Releases: master
Change-Id: I78d631dbf3ea206c78d65c6e4d3a60ab984fa1c9
Reviewed-on: https://review.typo3.org/52170


Tested-by: Riccardo De Contardi <erredeco@gmail.com>
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: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>