* ignore kad
* fix swarm, and minor
* fix init and swarm
* ignore pb
* enable mypy
* fix basic host
* fix tcp
* fix mplex
* add typing for pb
* skip format pyi
* [mypy] no need to ignore pb now
* add typing to chat
In `Pubsub.continuously_read_stream`, it checks whether this is a
control message enclosed in RPC message with `if rpc_incoming.control:`.
However, in pb2, the condition is always true because a default value is
returned when a field is not set. Solved it by changing it to
`if rpc_incoming.HasField("control"):`.
* Add handle_rpc call to pubsub
* Scaffold gossipsub functions
* Add timer
* Implement most of mesh construction
* Implement emit and handle
* Implement fanout heartbeat
* Refactor emit
* some gossipsub cleanup and test
* minor lint stuff, more to come
* Implement publish
* Fix comment
* Modify pubsub/gossipsub so that floodsub tests pass using gossipsub router
* Add floodsub tests to gossipsub
* Handle case where select_from_minus, num_to_select > size(pool-minus)
* Add topic membership
* Implement handle ihave
* Implement most of iwant
* Add mcache.add and comments
* Refactor handle_ihave
* Implement stream write in handle_iwant
* Implement gossip heartbeat
* unresolved vars
* initial mcache code
* documenting mcache
* writing test/debugging mcache
* finished mcache test and debugged
* Make gossipsub backward compatibility its own file
* remove mcache prints
* DEBUGGING
* Add sender_peer_id to handle_rpc to get gossip test passing
* Modify gossipsub to make fanout work
* fanout maintenance test
* debugging gsub GOSSIP
* DEBUGGING
* debugged sender seen cachce
* adding lru, removing prints
* pylint cleanup
* Fix github comments in PR
* minor floodsub possible bugfix
