Weird forks

[EduMenges]

Some submodules have their upstream set to a fork that haven't been updated in a while and really should point to the super repository.
These are:

• hat-trie
• libp2p while it is our fork, it is the fork of a fork. Some fixes have already been done in the original repo and we had to duplicate them. Also it is very outdated.
• xxHash is 1000+ commits behind the original repo

Some can't be removed since they have adaptations to CMake, but if this is the case, it's better to fork into the GeniusVentures organization than use a fork that some random guy did 5 years ago.