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Support unit64 offsets #50

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@36000

Currently, if I try to load a trx file using trx-cpp that has offsets larger than int32 max, it segfaults. This PR may be related: #49

With pyAFQ, we sometimes generate tractograms with 100s of millions of streamlines, and here, TRX is super convenient (really the only file format that can handle that many streamlines). These work with trx-python but not trx-cpp. Let me know if you would like me to provide files to reproduce the error. Maybe I am doing something wrong on my end, but I think it's caused by int32 being hardcoded in certain places.

Thank you,
John Kruper

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