Merge branch 'feature/use-ADL-for-std-functions' into 'master'

Bernd Flemischrequested to merge
cherry-pick-e367ddd8 into next

Feature/use adl for std functions

  • std::swap and dumux/common was cleaned up
  • much more needs to be done
  • I found a bunch of other clean-up stuff

See merge request !259 (merged)

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