ENH: Adding dynamic-mesh motion capabilities to various solvers

Summary

With the commit, the dynamicMeshMotion functionalities and the following solvers can operate in combination.

• buoyantBoussinesqPimpleFoam
• buoyantPimpleFoam
• rhoCentralFoam
  • rhoCentralDyMFoam has been merged with rhoCentralFoam

Resolved bugs

N/A

Risks

• No changes in user input.
• No changes in any output of the existing tutorials except those for rhoCentralFoam.

Tests

• Compilation (incl. submodules):
  • linux64ClangDPInt32Opt (clang11)
  • linux64GccDPInt32Opt
  • linux64GccSPDPInt64Debug
• Alltest: No change in output with respect to the develop HEAD + no error