Check some universal folder for ISO data, and if its not found then fall back to vanilla file util

[Zedb0T]

This way we can just drop a iso somewhere that is universally accessible then all mods just extract/compile immediately, instead of needing to copy iso_data/symlink 7000 for each unique mod.

[massimilianodelliubaldini]

See open-goal/jak-project#3692.