- removes "v" from the ProtocolVersion in the ServerMessage
- remove "v" prefix from GoTomatoVersion constant
- re-add "v" for for human readable output (`-version`)
- update README
- add ProtocolVersion variable to metadata package
- don't set `ServerMessage.ProtocolVersion` in `main`
- update `ServerMessage` default to include ProtocolVersion
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- define GoTomatoVersion constant for versioning
- add protocol version field to all server messages
- add `-version` cli parameter
- update README
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