[common.profiler] add DUNE_STUFF_PROFILE_SCOPE()
[common.profiler] add DUNE_STUFF_PROFILE_SCOPE()

If the user defines DUNE_STUFF_ENABLE_PROFILE_SCOPE=1, the macro
`DUNE_STUFF_PROFILE_SCOPE("section")` is defined an creates an instance of
`ScopedTiming`. This can be widely used without cluttering the code too
much, see for instance the next commits.

renemilk/DUNE-Stuff,renemilk/DUNE-Stuff,renemilk/DUNE-Stuff