Merge branch 'master' into dp/make-CallExecutors-generic-over-hasher-and-rlpcodec

* master:
  Upgrade to libp2p master (#660)
  Include function comments into modules `json_metadata` (#657)
  Replace old headers with CHT in light clients (#512)
  Fix build
  Introduce treasury and document (#646)
  Off-the-table staking preference (#656)
  Implement function `json_metadata` in `decl_module!` (#654)
  Fix warnings in networking (#652)
  Add a reputation system (#645)
  Check for pruned block state (#648)