Decision to not use doxygen for licence headers. Removes doxygen formatting and file tag.

Pulls some author and date information from previous headers, adds this to information from the svn and git repositories.
Inlude the standard copyright header to approximately 2000 files with institute of original committer as copyright holder.
Contributing authors from previous declaration and repository records.

The latest version of our formating rules is applied to all header and source
files as well as to the macros using clang-format 11.0.

Apply code formatting to all source/header files and root macros.

This version is an exact copy of the last revision of the trunk branch
of the old SVN repository of CbmRoor at
https://subversion.gsi.de/cbmsoft/cbmroot/trunk
The old SVN repository will still be available for read access.