Large Cmake update
The MR updates the CMake setup to properly set RPATH at installation time. This fixes the issues we saw on both Ubuntu and macOS.
Also, it dynamically creates a runtime setup script to properly set the GXPLUGIN path for the users.
It also modernize the CMake setup and clean everything, by removing relics from the first implementations.
The code must be compiled on top of the latest version of GeoModelCore and GeoModelIO, which implement similar installation settings.
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pinging @boudreau , @dellacqu , @tsulaia , @mbandier for info.