Extended Family of a scratch

[1superchip]

Is your feature request related to a problem? Please describe.
Some projects have different versions such as PS2 versions and GC versions or different presets on the same platform. Rather than linking scratches of different versions in comments, an "extended family" could be used to link related scratches together.

In some circumstances, debug versions exist which may help match another version. These debug versions may have a different preset or different assembly with no way to link the scratches to each other.

Describe the solution you'd like
A family-like list of scratches that appears just as the existing family does (Separated from the existing family) which the owner of a scratch can add a scratch to by link. This would require modifying the frontend and the backend to support saving scratches as extended family.

Describe alternatives you've considered
None

Additional context
A potential format for the family page: