ENH: improve file reader support for runTimePostProcessing (#1091)

- support .vtp format for geometry, surface, line, cloud.

- use native reader for handling vtk, vtp, obj, stl surface files.
  For other formats, use the MeshedSurface (the surfMesh lib) to
  handle reading and Foam::vtk::Tools::Patch to handle the
  conversion to vtkPolyData. This combination is more memory efficient.

- update tutorial case to include vtp surface geometry

src/functionObjects/graphics/runTimePostProcessing/functionObjectBase.C

@@ -79,7 +79,7 @@ Foam::functionObjects::runTimePostPro::functionObjectBase::functionObjectBase
 (
     const stateFunctionObject& state,
     const dictionary& dict,
-    const HashPtrTable<Function1<vector>, word>& colours
+    const HashPtrTable<Function1<vector>>& colours
 )
 :
     fieldVisualisationBase(dict, colours),