The problem with missing include files only becomes obvious after clang-format
changed the order of the include statements.

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.