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switchable communication backend

Christos Tsolakis requested to merge christos.tsolakis/paraview:switchable-backend into master

This MR enables compiling with both Thallium and Asio backends and allows to switch between them upon runtime through the PARAVIEW_COMMUNICATION_BACKEND= {"THALLIUM","ASIO"} environmental.

The code is reorganized and now the sources of both backends live under Services/Backend , the ParaView::ServicesAsio and ParaView::ServicesThallium modules are now gone. All examples and executables link to the new module ParaView::ServicesBackend.

Alongside the support for both backends we now have ci for both backends on linux. To save time we use a single build job that is reused by tw test jobs. To start on a green ci we introduce fixes of the thallium backend mainly related to replacing the use of rxcpp::subjects with cold observables and picking an appropriate coordination.

Edited by Christos Tsolakis

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