Automatically gather some media property docu for processes
With this MR used media properties are automatically extracted from the ctests and added to the Doxygen documentation page of the respective process. This is one step for extended and up-to-date process documentation. Having this information automatically on the OGS website (not in Doxygen) would be better, but the Doxygen version was easier to implement for me.
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Feature description was added to the changelog