Update or refresh ConsoleUI mod list after repo or compat changes

[HebaruSan]

Problem

If you edit your current instance's repositories in ConsoleUI, the new module list is not fetched.

If you edit your current instance's compatible versions in ConsoleUI, the mod list is not updated to reflect the new compatibility.

Cause

We refresh the mod list if you switch instances, but not otherwise.

Changes

Now if you add or remove a repo, we update the registry upon returning to the mod list.

Now if you change the compatible versions, we refresh the mod list upon returning to it.

Fixes #3352.

[DasSkelett]

Not so smart compiler:

I don't think we actually need GetHashCode(), since we aren't using the repositories as keys of a sorted list/dictionary/hashset anywhere (only as values). But if we want to get rid of the warning, we have to implement it.
But we could keep it a simple one. Since implementations of GetHashCode() only have to guarantee that equal objects have the same hash code, but the same hash code doesn't require the objects to be equal, and we don't rely on as few collisions as possible for performance, we could just return name.ToHashCode() and be happy.

[HebaruSan]

OK, returning name.GetHashCode() now.

[DasSkelett]

Thanks, works great!