Log Message:
pdal-lib: updated to 2.8.4

2.8.4

Handle null strings as tests for startsWith and endsWith.
add zenodo citation information
Add new section to pipeline docs: "multiple writers and output types"
Use gdal_fwd.hpp when available for forward declarations
Source tree cleanups
fixes md5 link to 2.8.3
Define destructor in source file for CSFilter.
upload .conda files from conda package build CI
Update include directives for LasReader and LasHeader in transition from libLAS \ 
to PDAL guide
Fix bad calculation for max width cases in readers.copc
Read quickinfo or filters.stats to create TileDB array