Improvements to the conversion utilities

Merged Mark OLESEN requested to merge feature-convert into develop

Various changes associated with issue #204 (closed).

  • Reduced code duplication for handling prostar conversion and IO
  • Simple conversion to/from AVL/FIRE geometries
  • New library basis for conversion to/from CCM geometries - handles multiple regions, conformal interfaces etc. No support for film or 2d shell geometries
  • Improved infrastructure for writing VTK content. Will propagate usage through other parts of the code in the future.

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