Replace a lot of duplicated case code with macros.
Some minor constifications of function parameters.

I restrained from shorten the SAL_MSG_* via preprocessor concat,
so a grep will still find the whole names.

Change-Id: If1f2477fc8817b4ae7816e807154e35004bb4da9
Reviewed-on: https://gerrit.libreoffice.org/43531Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>