predictabilize_uuids doesn't work with target dependencies

predictabilize_uuids doesn't work with target dependencies, for example, if you want to generate a project with targets for both an iOS app and its share extension, the app target needs to depend on the extension target. When "predictabilizing" UUIDs for such a project, the UUIDs for some of the share extension objects will not be stable.

The reason for this is that the original random UUIDs are included in the values of UUIDGenerator's `paths_by_object` property, which must contain only stable data, since it's hashed to to produce the stable UUID.

For my use case, I was able to work around the issue by adding this line:

```diff
def tree_hash_to_path(object, depth = 4)
return '|' if depth.zero?
case object
when Hash
object.sort.each_with_object('') do |(key, value), string|
+ next if key == 'remoteGlobalIDString' || key == 'containerPortal'
string << key << ':' << tree_hash_to_path(value, depth - 1) << ','
end
when Array
object.map do |value|
tree_hash_to_path(value, depth - 1)
end.join(',')
else
object.to_s
end
end
```

However, I don't believe this is a real solution for the problem, since this effectively ignores the target relationships when generating stable IDs.