update include guards

dune/xt/common/algorithm.hh

dune/xt/common/color.hh

dune/xt/common/compiler.hh

dune/xt/common/configuration.hh

dune/xt/common/convergence-study.hh

dune/xt/common/crtp.hh

dune/xt/common/debug.hh

dune/xt/common/exceptions.hh

dune/xt/common/filesystem.hh

dune/xt/common/fixed_map.hh

dune/xt/common/float_cmp.hh

dune/xt/common/float_cmp_internal.hh

dune/xt/common/float_cmp_style.hh

dune/xt/common/fmatrix.hh

dune/xt/common/fvector.hh

dune/xt/common/localization-study.hh

dune/xt/common/logging.hh

dune/xt/common/logstreams.hh

dune/xt/common/math.hh

dune/xt/common/matrix.hh