Code review of ICC profile security issues documented by PAWG

[dwtza]

Review identified issues missing code coverage. This issue was created during PAWG at the ICC Hong Kong 2025 meeting.

[ChrisCoxArt]

If any issues are related to raw sprintf calls, I'm already working to convert them to snprintf (just to quiet the 3300+ warnings).

[dwtza]

@ChrisCoxArt this to-do is related to a list ICC profile security issues that have been identified PAWG. I've updated the issue to clarify the scope.