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They may not support the protocol. Or they may just not give us what we're
looking for. We might as well keep asking till someone answers.

* We might as well just call this Pubsub.
* Make the description a bit more generic.

update go-libp2p-pubsub package and remove internal bootstrapping since we can just use pubsub discovery

Wrapped protocol read/writes in contexts.
A little refactoring.
Protobuf Makefile builds on Windows too.

Improved the get-latest protocol (protobufs for request and response, response can have nil data, use standard gogo protobuf tools).
Changed the protocol string for the get-latest protocol.
Separated out get-latest protocol and gave it explicit tests.
Added more tests and modified an existing one to take into account the use of the get-latest protocol.
Update go.mod to use newer (still forked) version of pubsub that has better peer event handling.
Changed rebroadcast to use one goroutine instead of one per topic (also upped the rebroadcast interval).
* Fixed existing issue with hanging on failed pubsub subscription.
Better handling of contexts.
Misc. code cleanup.

A quick fix for #28 (https://github.com/libp2p/go-libp2p-pubsub-router/issues/28) that makes sending out Provide messages in PubSub bootstrapping non-blocking

Instead of using bare keys (binary), use `/record/base64url(key)`. This:

1. Pubsub keys must be UTF-8. Record-store keys definitely are not.
2. The prefix may help with validators in the future (namespace *everything*).

See: https://github.com/ipfs/interop/pull/39

License: MIT
Signed-off-by: Łukasz Magiera <magik6k@gmail.com>