Expose vis it bridge
This aims at exposing VisItBridge for external vtk modules, specially in the context of a ParaView plugin.
As a main change, the bridge logic is in its own module. We now have the following:
- the module VisItLib is the core of VisIt, in the
- the module IOVisItBridge contains only the actual bridge part, in the
AvtAlgorithmsdirectory with the abstract vtk readers, *.in files and the VisItReader.cmake script
- the module IOVisItReaders contains the readers, in the
Related changes in ParaView are here: paraview!4462