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

(For formatting, clang-format was used with the format config file
from https://redmine.cbm.gsi.de/issues/1760:

    clang-format -style=file -i matbudget_*

Those materialbudget simulation and analysis macros are totally
outdated and do not work any longer.
New macros based on /macro/sts/matbudget_{mc,ana}.C
will be added in a separate commit.

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.