Graph reference 3.0:

- enable easily-configurable language-dependent
  meta descriptions of graph objects.
- split `graph_objs_meta.json` output file
  into language folders (`./graph_objs/<lang>/`)
- split setup, meta-generating functions,
  meta shortcuts and run command into separate files (in `./scripts/`)
- replicate previous `graph_objs_mets.json` (yeah!) 
these are nit-picky, but i'm just cruising through and commenting, we might have language issues arising from 'A' vs 'An', etc. I'm not sure what the obvious solution is to this other than... rephrasing? Again, this could get tested.