Add CAD clip-box and name-based part selection to O2_CADtoTGeo

Support culling/cutting the CAD model against an axis-aligned --clip-box
(with --clip-deduplicate {none,intact}) and whitelisting/blacklisting
parts via --include-name/--exclude-name regexes before TGeo conversion.

Aided by GPT-5.5 (Copilot CERN pilot licence)

Author: sawenzel