[PATCH] Fixed unchecked typecasts and fixed LUT handling.

[PATCH] Fixed unchecked typecasts and fixed LUT handling.

This commit adds further fixes for unchecked typecasts of DcmItem::search()
results (see description of previous commit). Furthermore, this commit
specifically addresses the handling of look-up tables (LUTs) in module
dcmpstat, where attribute (0028,3006) LUTData may use either US or OW
value representation, and (0028,3002) LUTDescriptor may be either US or SS.
The code should now properly handle all permitted value representations.
LUTData is now always written as OW in order to avoid the 64k size limit
for US in explicit VR encoding.

Thanks to Martin Zeiser from the Cisco Talos team
<vulndiscovery@external.cisco.com> for the bug report (TALOS-2024-1957).

Together with the previous commit, this closes DCMTK issue #1120.

Gbp-Pq: Name 0002-Fixed-unchecked-typecasts-and-fixed-LUT-handling.patch