graphics/simage: Update 1.7.0 => 1.8.4, take maintainership
Changelog:
https://github.com/coin3d/simage/blob/v1.8.4/NEWS
- Upstream migrated to GitHub.
- Confirm and update LICENSE (ISC and MPEG2ENC).
- Migrate to cmake.
PR: 292126
Co-authored-by: Vladimir Druzenko <vvd@FreeBSD.org>