Make package version independent from protocol version

[Gjum]

Every time the protocol changes (and this can happen several times a day), a new version is released. This is annoying and a better solution is needed.

Ideas so far:

• host a file with the protocol specification in some standardized format
  • updated live from the official client's source
  • all clients parse it on startup and "build" the protocol on-the-fly
  • users can override this with a local file or specify another URL, to be independent from a single hoster
• every client parses the official source on every startup and "builds" the protocol on-the-fly
  • large overhead on the client side
  • could be error-prone if website format changes, fall back to default or last working protocol in this case
• [insert your idea here]