Read crs from input files

[uclaros]

This fixes a long standing issue, untwine is ignoring the input files' crs.
There have been related open issues in QGIS (eg qgis/QGIS#59662), however the issue has gone some times undetected due to QGIS reading the crs from the .las/.laz file when this is loaded instead of reading it from the copc.

To replicate:

$ pdal info --metadata test/data/autzen_trim.laz
# input file has crs
$ untwine -i test/data/autzen_trim.laz -o test/data/autzen_trim.copc.laz -s
$ pdal info --metadata test/data/autzen_trim.copc.laz
# output file has no crs :(

[hobu]

What happens for a set of files with multiple different CRSs? The last one read will be used?

[abellgithub]

This is certainly a regression and shows that we need some tests.
@hobu The multiple SRS case should be handled (it was at one point), but again, there should be tests.

[abellgithub]

Amazing that this has been around for almost a year with no report.

[uclaros]

Now that you mention tests, I think the non ascii filename on windows bug is back :)
Scratch that, the issue is probably in QGIS as untwine.exe on the command prompt works correctly.