Review of the Wire Protocol

[kevaundray]

The wire protocol is now usable, however there are still things that I believe need to be implemented, some now and some further down the line:

MSGPING, MSGPONG: These will be used to verify that the node is still alive without having to do the handshake with it.

MSGReject: This is an important message for those looking to debug code, instead of silently disconnecting. The node will send a MSGReject stating why he has rejected the request.

MSGFilters: These will be implemented later down the line when either GCS/Bloom has been made.

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This package has been designed so that the inner workings can be easily changed without the outsider having to edit their code if they rely upon it. I believe that optimisations can always be made and so this package should be visited periodically to review, add more tests and optimise.

[kevaundray]

Periodic Review:

The wire protocol is now usable and has been tested in a seed node implementation. In the future, it may refactored to allow versioning using go mod.