[TASK] Optimize colors in modulemenu

changes colors and use the base variables set in the file.
cleanup of pagetree svg icon and add class icon-color.

Resolves: #80023
Releases: master
Change-Id: I6809e7930c118d9e4cc55035f0cf687c02a5958b
Reviewed-on: https://review.typo3.org/52162


Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>