Feature/use standard gridcreator for structured grids

Merged Timo Koch requested to merge feature/use-standard-gridcreator-for-structured-grids into master

Cleanup in the face of new grid creator

  • Replace some dgfs for structured grids by their input file equivalent
  • Add a test using gmsh grid (2p adaptive cc)
  • Remove obsolete includes
  • Read FieldVectors from input file in some places
  • Fixes the restart co2 test

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