Expose method for setting poppler-data location in C++ frontend

The R bindings are exclusively using the C++ frontend, except for the part below where we need to set the location of the poppler-data files (which we ship with the application):

#include <GlobalParams.h>
void find_poppler_data(){
  static bool initiated = false;
  if (!initiated && strlen(poppler_data)){
    globalParams = new GlobalParams(poppler_data);
    initiated = true;
  }
}

It would be great if this can be exposed in the C++ API so we don't need the legacy API.

Edited Dec 17, 2018 by Jeroen Ooms

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