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Enable "filters.shell" to be used as the initial stage in a PDAL pipeline, which would allow for more flexible data preparation and filtering workflows without needing external shell scripts.
> PDAL: Pipeline does not start with a reader. I'd like to do some weird stuff where I prep some vector geometry data by a buffer and then pass it into `readers.copc`'s `ogr` block for filtering. I can do it now by making a little shell script, but it would be handy to have it all be part of the pipeline [`filters.shell`](https://pdal.io/en/latest/stages/filters.shell.html)-style.