[FEATURE] Rebrush FlashMessage / state colors

Rebrushes the FlashMessage layout and output. Better
contrast of box and text. Prominent links. Lighter boxes.

Resolves: #62580
Releases: master
Change-Id: I7db1dbf8aa8ce8d626757c001c1f1a1621d1a303
Reviewed-on: http://review.typo3.org/33666
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>