Moves the proprietary-format inspection commands out of main.cpp
into their own translation unit. Each reads a Blizzard-format
file and prints its structure:
--info-png --info-blp
--info-m2 --info-wmo
--info-adt --info-jsondbc
main.cpp drops 18,198 → 17,766 lines (-432). Behavior verified
by re-running --info-png on a generated noise texture.