Add version checks for guppy and lib

[Psy-Fer]

After starting the guppy server but before connecting a client, I should do a check that the guppy server version matches the installed guppy client lib version.

I think I can do this with some API calls to the server and some lib version check stuff for the lib.

This should help give a more informative error in the case where they don't match but the output is...weird and not helpful.