Add support for multiple tiled vpc overviews#86
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Allow creating multiple tiled overview files for a vpc.
A new option
--overview-lengthis added topdal_wrench build_vpc.The name is modeled after
pdal split's andpdal tile's--lengthparameter, and sets the maximum length/width of overview files to generate.The decimation logic is preserved (still picking every 1000th point) but the output is tiled on a grid of size
overview-length, generating files named<stem>-overview-1.copc.lazetc.All overviews intersecting a vpc's file are added as extra assets with role
overview.