[feature] Reduce 3d input file size

[dmonah]

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Is your feature request related to a problem? Please describe. I want to run a number different experiments all with the same 3d mesh. My mesh is quite large and so each of my input files (which contains lists of triangle vertices and indices) takes up a relatively large amount of disc space.

Proposed solution Rather than list the same vertices and indices in every input file, it would be useful to have a single mesh file containing these values and just require a file path in the input file.